I think all these online games and gambling stuff is time consuming and wasting money... is there any one who can actually say he become rich with this?
Gambling in most of the cases has negative EV, and that's why you should gamble for fun but not for profit.
BTW, gambling is a zero-sum game. While gamblers will most likely lose their money, gambling site owners will become rich from it.

Exactly. People who gamble in a healthy way aren't really expecting to get rich, we're expecting to lose money. However, I also lose money when I got to a movie, or when I buy a sandwich or a beer. Sometimes you trade money for fun---I consider gambling to be in that class of activities.