I've a friend of mine who always complain that ever since he started gambling he haven't won a good amount, instead he'll be winning less money than what he expected but he can't stop.
It’s just because they have the confidence that they are going to win if they don’t give up. Some of them do hear about other people's success stories, so it’s always encouraging them to gamble more, if they keep on gambling, they are going to win. Some of them will have already lost a significant amount of money, so they will be trying to win back the money they have lost, so they are always finding it very difficult to stop. The funniest part is that if some of them are able to win back their losses, they won’t stop gambling, they will continue gambling, thinking they will be able to win.