No one becomes rich from gambling. You can observe better people around you if someone had ever won that just lost money again back by keep playing. Gambling let you win but bring you back in game to try to make much more and you loose all. You can win but can't keep that money for longer time. That's why can't become rich from gambling.
There are some individuals that are becoming rich from gambling and that would be the house edge itself and those people who are hitting the jackpot luckily. But if you are going to gamble as a normal gambler and you are aiming to become rich with it then stop that dream as it is really impossible to become rich with gambling if you are just a normal gambler.
Yup, only the dedicated gamblers can make a profit in gambling. Normal players just play for fun don't expect any money in gambling. It is not that much easy. First You have to lose so much money to become a professinal gambler. Then there is a chance to make a profit in gambling otherwise better stay away from this gambling.
The ones that are really serious with gambling and devote their time to learn the techniques to win, they are treating gambling as their job that is why they are successful and I believe some can do that while most of the people have tried but failed.