In short, if your bankroll is small, you will win small, but if you lose all that you have is gone, and your loss if you are poor is much worst than those rich gambler.... That would just keeps a poor gambler coming back to gambling whether win or lose... Becoming rich in gambling might need a lot of luck and most of all a lot of money to make you rich in shortest time possible...
I agree, you can't get rich just by gambling. Only casino owners or gambling sites benefits from gambling. They make tons of money everyday because to those people who lose so much money in gambling everyday. And gamblers don't realize that. They just think it is their ticket of getting rich quickly. But its not them that will be rich but the owner or the house.