The guys say that in a Canadian casino they give to win 1/3 of the casino's profit, and this winning is distributed randomly. There are no schemes for cheating slots, it’s like in a lottery - someone is lucky and someone loses the last money. I think that in a casino you need to be able to stop in time, if you win, then take the money and leave, then you will come back, this is the only way you can be in the black...