The biggest factor here is self control, the greed to win more never gets satisfied until one loses every coin he have. Instead of celebrating, you'll end up crying.
It will be hard for someone to have this self-control if he is too confident about himself because he is winning in gambling, it is a bait where if he bite it, the next time thing that would happen to him is he is starting to lose his money. The house is very tricky, and if we are going to let it trick us every time, there is no other thing that we are sure but to lose. Gambling house job's is to make a huge bankroll every single day.
Coming from that, it is obvious that it was made to win most of the time, competing against it will just make you miserable at some ways.