With gambling you need luck and the fact is that not a lot of people have this luck, some people win 30k at a lottery, its all possible but you just need luck.
How about this gambler , Dan Bilzerian
Surely he's the luckiest poker player I've ever meet.
AFAIK, he can earn up to $ 1 million per day or loss $ 500.000 / day ( surely that's insane !! ) But he always end in profit.
Imagine if he bought bitcoin and gamble with it, I'm sure that he can got richer ....