What is the sunk cost fallacy in gambling?
The sunk cost fallacy is continuing to stake because of money already lost, as if more play could repay it. A past loss is gone whatever happens next, and each new round has the same expected cost as before. A limit fixed before play removes the decision from the moment when it is hardest to make.
Definition
A sunk cost is money already spent that cannot be recovered. The fallacy is letting that money steer the next decision: "I have lost KES 3,000 tonight, so I cannot stop now."
In a game of chance the past loss has no effect on the next round. Rounds are independent, and the only question that matters is what the next stake costs on average. That figure is the stake multiplied by the house edge, as set out in the guide to RTP and house edge.
A worked case
Assume a game with a 4% house edge and a stake of KES 100 a round. Each round costs KES 4 on average. This is true for a player who is KES 3,000 down and for one who has just started.
The player who is down feels that a win will "make the loss worth it". The game has no record of the loss. A further 30 rounds cost an expected KES 120 for both players, and the KES 3,000 stays lost in both cases.
Staying in play to justify the money already spent therefore adds to the total cost without reducing the old loss. The expected total is the sum of the expected costs of every round, a point developed in the entry on expected value.
Why a limit helps
The urge to continue is strongest when the loss is largest, so a decision taken then is the weakest one. A limit is decided earlier, when the arithmetic is easy to see: an amount in KES, a number of minutes, or both.
Regulation 87(2) of the Gambling Control (Conduct of Gambling Operations) Regulations, 2026 requires licensees to provide deposit limits on a daily, weekly and monthly basis, loss, session and expenditure limits, and reality checks that show duration of play. It also requires an easy to access self-exclusion option for at least twenty-four hours.
The related behaviour of raising stakes to recover money is covered in the gambler's fallacy and session limits and, in its formula form, in the Martingale system guide. Gambling is addictive: play responsibly, only with money not needed for anything else. Support and the self-exclusion process are on the responsible gambling page.
Questions and answers
Is chasing losses the same as the sunk cost fallacy?
They are closely linked. The sunk cost fallacy is the belief that earlier losses justify more play. Chasing losses is the behaviour that follows: staking more, or depositing again, to win the money back.
Does a limit make a game fairer?
No. A limit does not change the house edge on any bet. It caps how much money is exposed to that edge, so it caps the expected cost of a session.
Which limit tools must a licensed platform in Kenya offer?
Regulation 87(2) of the Conduct of Gambling Operations Regulations, 2026 lists deposit limits on a daily, weekly and monthly basis, loss, session and expenditure limits, reality checks showing duration of play, and an easy to access self-exclusion option for at least twenty-four hours.