Gambling is a lose, it can't be good. The risk of losing everything just to make a small return then risk it again seems bad. I guess if you play for dust on slots or something it is ok. People always get carried away though in the and and lose more then they planned on.
Yes, gambling is all about luck. If you ever gamble just make sure that you have full control of your body and mind.
The thing here is the more that you win, the more that you are willing to spend and spend and crave more to win.
With that being said, rather than gaining you start losing without noticing that you ended empty handed. Finally, its all about self control.