Gambling is not a job or a way to make stable income, however you can try your luck and maybe you will win jackpot but most likely you won't. It is pretty much the same thing as lottery, either you will win big and make some big money or you will lose in long run. If you want to make stable profit then you should look at the other side of gambling and that is investment in gambling sites bankroll, that is how you will make money in long run.
Yes gambling cannot be take as a mean of earning, but we can only use it for making money in short time, which i think cannot be possible from a regular job, although the winning chances are less than losing, but still i think a lot of people are there who have make a lot of money from gambling and therefore they consider gambling as the shortest way of making money.