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 Being afraid of "casino bonus hunters" online casinos have created new type of casino bonuses. The traditional casino bonuses that are fully cashable became known as "sticky" or "phantom" bonuses - the equivalent of lucky chips in real casinos.
The amount of the casino 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). It is important to understand what kind of the casino bonus is offered by a casino to choose casino bonus wagering strategy.
The difference between sticky and non-sticky is that instead of being cashable after meeting the casino bonus play-through requirements, sticky casino bonuses are for "wagering purpose only".
At first sight it may seem that there is little sense in such a casino bonus - you won't get money anyway, but it's not completely true. If you win, then there is really no point in the casino bonus, but if you have lost, it may be of use to you. Without a bonus you have lost your $100 casino deposit and that's it, bye-bye. But with the casino bonus, even if it is a "sticky" one, loosing $100 of the deposit $100 casino bonus is 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 casino bonuses player needs to use the strategy "play-an-all-or-nothing game". Really, if you play betting with small stakes, you will slowly and surely lose because of the negative math expectancy in the casino games, and the sticky casino bonus will only prolong agony, and won't help you to win. However, the profit of the bonus comes from the fact that the player can play with the house money and may keep the winnings.
Wise casino players usually try to achieve results of wagering sticky casino bonuses on the early stages of the game.
Sticky casino bonuses must be played aggressively, it would help to avoid "work hard" through the whole casino bonus play-through requirements and get the results early. If number of big wins comes early, the player can always cut back the bets and "work hard" through the wagering requirements with smaller stakes to protect his winnings from that point on.
Some players 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 players 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 casino bonus for you is (100+150)/500*(500-150)-100=$75
If you managed to double the money in your casino account, do not raise the bets again. The closer you are meeting the casino bonus wagering requirements, the closer that money you have already won is to being yours to withdraw.
In summary, aggressive play of the sticky casino bonuses requires a professional-level understanding of risk versus return as well as big enough bankroll to invest into the future winnings if a long losing trend occurs. Besides, the strategy is complicates by such things as restricted games for wagering, the games betting limits, the play-through requirements for the particular casino bonus, the house edge for the particular casino game. | 
