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Banned for Winning? Why Bookmakers Limit You (2026)

Why bookmakers limit winning accounts, what being gubbed or stake-factored means, and why Polymarket doesn't limit winners

8 min read
Tom Hill Independent prediction-market educator Follow on X
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I’ve been banned by somewhere between 40 and 50 bookmakers. Not banned in the sense of being thrown out: they still let me log in and deposit. But on sports, most of them will take $10 or $20 from me and nothing more, and a few won’t accept a sports bet from me at all.

I wasn’t cheating. I was mostly value betting and arbing: betting when I thought the odds were in my favor. Sometimes that was on small markets, which gets you limited fastest. Sometimes it was on the NBA and the NFL, which are about as liquid as sports betting gets.

If you win consistently at a sportsbook, this will happen to you too. This article explains why, what it looks like, and why it doesn’t happen on Polymarket.

What “Banned” Actually Looks Like

Bookmakers rarely close an account for winning. They make it useless instead. In my experience it comes in three forms:

  • Stakes cut down and down. Every bookmaker has a maximum it will accept on each bet. If you keep winning, your personal maximum shrinks, then shrinks again. The internal name for this is stake factoring: your account is set to a fraction of the normal limit. A market that takes $1,000 from most customers takes $5 from you.
  • Every bet goes to trader review. Instead of being accepted instantly, your bet waits for a trader to approve it. They may accept part of it, offer a worse price or reject it. By then the price you wanted has usually moved.
  • No sports bets at all. Some books simply stop accepting sports bets from you.

In the UK this is called being gubbed. Elsewhere it’s being limited or restricted. Different words for the same practice.

Why Bookmakers Limit Winners

A sportsbook is the house. When you bet $100 on a team at 2.00, the bookmaker is on the other side: if you win $100, it loses $100.

Its business works because of two things:

  1. The margin built into the odds. The vig (also called juice or overround) is the gap between the true chances and the prices offered. On a typical market it’s about 4% to 10% of your stake.
  2. Most customers losing over time. The margin only works as a business if the people paying it don’t consistently beat the price.

A bettor who does beat the price, especially one who keeps getting better odds than the line closes at, breaks that model. The bookmaker can either change its prices or stop taking that person’s bets. Stopping the bets is cheaper, so that’s what it does. Winning on small or obscure markets gets you limited fastest, because those are the lines a bookmaker prices least carefully.

None of this is illegal in most places, and books aren’t hiding it. It’s in the terms you agreed to when you opened the account.

Why Polymarket Has No Reason to Limit You

Polymarket isn’t the house. It’s an exchange: every trade is you against another user. If you buy “Lakers to win” at $0.55, someone else sold it to you at $0.55. When the game ends, one of you is paid and the other isn’t, and Polymarket isn’t on either side.

Polymarket makes its money from a small trading fee on each trade, whichever side wins. That flips the incentive completely:

  • A winning trader costs Polymarket nothing. Your profit comes out of another trader’s position, not the platform’s.
  • More trading means more fees. Polymarket wants you to trade as much as possible, and it actively rewards volume: high-volume traders get lower fees through taker tiers, and traders who post limit orders pay no fee at all and earn a maker rebate.

From where I sit, that’s the single biggest difference between Polymarket and a sportsbook. A sportsbook wants losing customers. An exchange wants active ones and doesn’t care who wins.

What Limits You on Polymarket Instead: Liquidity

There’s no stake limit, but there is a practical ceiling: the order book. You can only buy what other people are offering to sell.

What surprised me most when I started trading sports on Polymarket was how big that ceiling is on major markets. On an NBA game, or a Champions League or Premier League match, you’re typically looking at tens of thousands of dollars available at the best price, and sometimes up to millions at a slightly worse price. That slightly worse price is often still better than any bookmaker is offering.

That carries into in-play. Mid-match on an EPL or NBA game you can still get tens of thousands on at a fair price, and you can trade in and out as the game moves. Football, basketball and baseball are incredibly liquid in-play. Minor sports and lower leagues are thinner.

Liquidity is the thing to watch:

  • Thin markets. Player props, niche sports and small leagues can have little depth. A big order will move the price against you.
  • Far from the event. Liquidity builds as a game approaches. A week out, books are thinner than an hour before tip-off.
  • Market orders. A market order takes whatever is available. In a thin book that can mean a bad average price. Use a limit order and name your price, which also means you pay no fee.

What It Costs Compared With a Sportsbook

A bookmaker hides its margin inside the odds. Polymarket charges an explicit fee, calculated as shares × feeRate × price × (1 − price):

  • Most sports markets have a fee rate of 0.05. At a 50¢ price that’s $1.25 per 100 shares, about a 2.5% margin if you priced both sides. Further from 50¢ it falls toward zero.
  • NFL and college football game markets use a lower 0.03 rate: about 1.5% at 50¢.
  • Limit orders that rest on the book pay no fee and earn a rebate.

Add the bid-ask spread on top, which on liquid sports markets is usually a cent or less. Against 4–10% of vig at a sportsbook, it’s not close. The fee calculator prices any trade exactly.

Where a Sportsbook Is Still Better

Polymarket wins on most things for a serious bettor, but not everything:

  • Parlays and niche markets. Polymarket’s parlays are called Combos, and they’re pretty good, but someone has to take the other side of your exact combination, so sometimes you won’t get a quote. A sportsbook will always accept your parlay (until it limits you).
  • Very obscure markets. A bookmaker will price markets that nobody is trading on Polymarket.
  • Promotions. Sportsbooks pay sign-up bonuses and boosts to bring you in. Polymarket doesn’t, though for a winning bettor those offers stop the moment you’re limited.

Polymarket’s availability also depends on where you live, so check your country before you sign up.

Getting Started

If you’ve been limited, the easiest test is to open a Polymarket account and look at the order book on the next big game you’d normally bet. Check how much is available at the top price, then compare it with what your bookmaker will take from you. Create a Polymarket account here.

Frequently Asked Questions

Why do bookmakers limit winning accounts?
A bookmaker is the counterparty to every bet you place, so your profit is its loss. Its model depends on the margin built into its odds and on most customers losing over time. An account that wins consistently, especially by beating the closing price, costs it money, so the book cuts the maximum stake it will accept from that account or stops taking sports bets from it altogether.
What does gubbed mean in betting?
Gubbed is British slang for having your bookmaker account restricted. It usually means your maximum stakes have been cut to a few dollars or pounds, you have been excluded from promotions, or both. Elsewhere the same practice is called being limited or restricted.
What is stake factoring?
Stake factoring is the setting a bookmaker uses to scale how much each customer can bet. A new account might start at 100% of the standard limit; a winning account can be cut to a small fraction of it, so a market that lets most people bet $1,000 lets you bet $5. It is applied quietly, and you usually find out when a bet is rejected or reduced.
What is trader review on a bet?
Trader review means a bookmaker's trader has to approve your bet manually before it is accepted. For a restricted account, every bet can go to review, and the trader may accept part of it, offer a lower price or reject it. By the time it is approved the price you wanted is often gone.
Can Polymarket ban you for winning?
Polymarket does not take the other side of your trades, so it has no reason to limit you for winning. Every trade is matched against another user, and Polymarket earns its fee whichever side wins. What limits you on Polymarket is liquidity: how much is available in the order book at the price you want.
Is there a maximum bet on Polymarket?
There is no per-account stake limit. The practical maximum is the depth of the order book. On major markets such as NBA games or Champions League and Premier League football, tens of thousands of dollars are typically available at the best price, with far more available a little further down the book. Thin markets such as player props or niche sports have much less.
Does bet365 restrict accounts?
Yes. Like almost every sportsbook, bet365 limits the stakes it will accept from accounts it views as unprofitable to serve, which in practice means consistent winners. Restricted bettors typically see maximum stakes cut sharply on some or all sports.