I never heard that a gambler has won a lot of money and is very happy today. When a person come out of casino and ask him what happened, he would say I lost this and that money. All the money is taken by the casinos owners. Gamblers get nothing. They just waste their time and time. When they lose they think about their money all the time.
The craziest part even for those who has won a lot of money is that because of the mindset that things would always come to them pretty good in the long run as their luck would keep shining, they always end up betting it all away in the long run. The chances of winning big only comes once in a blue moon, so if you really want to consider the chances of losing to winning, you really do not want to be expecting much at the end of the day.
Winning in gambling is possible, but never readily available for every gambler and even if you manage to win, it is left to you to decide if you want to blow it all away back or do something tangible with it, which we know the former is the path most gamblers usually choose.