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Online Casinos. Mathematics Of Bonuses.
By ArthurP.
Online casino players know that the latter ones offer various casino bonuses. "Free-load" looks attractive, however, are they really useful these bonuses? Are they profitable for gamblers? The answer to this question depends on a lot of conditions. Mathematics will help us answer this question.
Let's begin with an ordinary casino bonus on deposit: you transfer $100 and obtain $100 more, which it will be possible to get having staked $3000. It is a typical example of casino bonus on the first deposit. The sizes of a deposit and bonus can be different, as well as the required stake rates, but one thing remains unchangeable - the amount of the casino bonus is accessible for withdrawal after the required wager. Till this moment it is impossible to withdraw money, as a rule.
If you are going to play in the online casino for a long time and rather insistently, this casino bonus will help you, it can really be considered free money. If you play casino slots with 95% pay-outs, a bonus will allow you to make on average extra 2000$ of stakes ($100/(1-0,95)=$2000), after that the amount of bonus will be over. But there can be complications, for example, if you simply want to have a look at a casino, without playing for a long time, if you prefer roulette or other casino games, forbidden by casinos' rules for winning back bonuses. In the majority of online casinos you won't be allowed to withdraw money or will simply return a deposit, if a wager is not made on the games allowed in the online casino. If you are keen on roulette or blackjack, and a bonus can be won back only by playing slots, make the required $3000 of stakes, in the course of 95% of pay-outs you will lose on average $3000*(1-0,95)=$150. As you see, you not only lose the casino bonus but also take out of your pocket $50, in this case it is better to refuse the bonus. Anyway, if blackjack and poker are allowed for winning back the bonus with a casino's profit only about 0,5%, so it can be expected that after winning back the bonus you will have $100-3000*0,005=$85 of the casino's money.
The "sticky" or "phantom" bonuses:
More and more popularity in online 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 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 bonus, but if you have lost, it may be of use to you. Without a casino 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 casino account, which can help you worm out of the situation. A possibility to win back the casino 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 a casino player 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 casino games, and the bonus will only prolong agony, and won't help you win. Clever casino players usually try to realize their casino 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 casino 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 casino 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 (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 casino games the results will be lower).
The cash back bonus:
There is a seldom encountered variant of a bonus, namely return of loosing. There can be singled out two variants - the complete return of the lost deposit, at this the returned money usually is to be won back like with an ordinary bonus, or a partial return (10-25%) of the loosing over the fixed period (a week, a month). In the first case the situation is practically identical to the case with a "sticky" bonus - if we
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