i think it depend on people whether to gamble for fun or to gamble for profit, different people have different mind, some people gamble only for fun because they want to relax themselves and they gamble with small amount that even in case of lose they does not affected. There are others who gamble only for profit and they make gambling the only source of income that's why they get addicted to gambling.
Yes you can not say that no one will gamble just for fun. if you look at the gamblers history, most of the gamblers will play to get relax. And they also play to win their bet, but if they lose money, they will not take that much serious. Those who play to make money they can not control their emotions when they lose money. This is the difference b/w fun gamblers and money making gamblers.
For this reason why gambling business never goes bankrupt, the fact that casual gambler percentage is much more than serious gamblers, this automatically affects more victory for the owner if we calculate in more detail, I suggest for ordinary gamblers to raise the level for more minimize defeat, no games that generate more profit if we do not think to be more serious.