That bonus: gift or bait?
A bonus is only as good as its rollover — the volume you have to wager before you can withdraw. Enter the terms and get a blunt verdict: excellent, acceptable, doubtful or a trap.
The idea
The rollover is where the gift goes back.
To clear a bonus you have to wager it many times over, and every wager pays the bookmaker margin. The higher the minimum odds required, the bigger that margin and the bigger the chance you never finish. Often the maths turns the gift negative.
Analyse a bonus
Copy the details of the promotion you are evaluating.
E.g. 'bet the bonus 6 times' -> 6.
Typically 1.50 - 2.00. Higher odds -> bigger bookmaker margin and a higher risk of not completing the rollover.
Acceptable
The bonus comes out slightly positive on average. It will not make you rich but it is fair.
Volume to bet
600 €
Effective bookmaker margin
8.0%
Expected loss
48 €
Risk of not completing
5%
Expected net gain
+47 €
Bonus efficiency
16.7%
Bonus: 100 €. The effective margin and the risk of not completing the rollover both rise with the minimum odds required. If the net is negative, the bonus is advertising in disguise.