More and more popularity in casinos is gained by “sticky” or “phantom” bonuses – the equivalent of lucky chips in real casinos. The amount of bonus is impossible to withdraw, it must remain on the account (as if it “has stuck” to it), until it is completely lost, or annulled on the first withdrawal of cash means (disappears like a phantom). At first sight it may seem that there is little sense in such a bonus – you won’t get money anyway, but it’s not completely true. If you win, then there is really no point in the bonus, but if you have lost, it may be of use to you. Without a bonus you have lost your $100 and that’s it, bye-bye. But with a bonus, even if it is a “sticky” one, $100 are still on your account, which can help you worm out of the situation. A possibility to win back the bonus in this case is a bit less than 50% (for that you only need to stake the entire amount on the chances in roulette). In order to maximize profits from "sticky" bonuses one needs to use the strategy “play-an-all-or-nothing game”. Really, if you play little stakes, you will slowly and surely lose because of the negative math expectancy in games, and the bonus will only prolong agony, and won’t help you win.

     Clever gamblers usually try to realize their bonuses quickly - somebody stakes the entire amount on chances, in the hope to double it (just imagine, you stake all $200 on chances, with a probability of 49% you’ll win neat $200, with a probability of 51% you’ll lose your $100 and $100 of the bonus, that is to say, a stake has positive math expectancy for you $200*0,49-$100*0,51=$47), some people use progressive strategies of Martingale type. It is recommended to fix the desired amount of your gain, for example $200, and try to win it, taking risks. If you have contributed a deposit in the amount of $100, obtained “sticky” $150 and plan to enlarge the sum on your account up to $500 (that is to win $250), then a probability to achieve your aim is (100+150)/500=50%, at this the desired real value of the bonus for you is (100+150)/500*(500-150)-100=$75 (you can substitute it for your own figures, but, please, take into account that the formulas are given for games with zero math expectancy, in real games the results will be lower).