The question is how much money can you bet.
What is you skill with it. So yeah you earn a lot or you can lose a lot.
May be you're right with gambling we can earn very much money or btc. But just as a reminder you can loss a lot too. Gambling is the probability and dont try to bet with all your money. Try with small amount is pretty good.
But what happens is just opposite things, people bet their hard earned and the money which they can't afford to loose. And after loosing the circumstances are worse, sometimes people quit life. So, better quit gambling than waiting for quit life.