Many people are already doing this. As several people have said, you have to have rules that you strictly follow, you have to be good at what you are doing, you have to have a bankroll already in place. Many people are professional gamblers who haven't worked a real job in their life before. It definitely is possible.
yes I learned many things from here.
If we go in a determined way to gamble with a measured level of bet amount with lot of attempts which is ensured by small bet amount then making a living from gambling is highly possible. If we play greedy then we might not find a living from gambling. So do it with determination, have a fun filled earning source.