Perhaps, some people live from gambling, but I am not sure about the number of them. I am sure that there are professional gamblers who are playing gambling and make money from gambling. But I think they don't expose who they are especially for people who can make a thousand dollars from gambling. That is difficult to become a professional gambler because we need to master the games. We need to have much experience in the games, and that will need a long time before we can be a professional gambler.
You can like sport betting and know how to analyse, you can play dice and believe in luck and still think you are professional enough but not, you can try other ways of gambling like playing poker and win today thinking you are a professional, but if today is good, that does not mean tomorrow can be. There are many people that will just think that way and depends only on gambling, these kind of people will have money today and leave poor later. They may later have issue with their wife leaving them and their life becoming miserable. Any good gambler you see out there only depend on luck, they were just lucky to hit the jackpot. Nothing like professional gamblers, the more people see it as profession, the more they lose. But the more someone see it as fun, using low amount of money to for it, there can be a day he will win jackpot. Many people will gamble but out of 100, less than one will be the ones that truly make it from gambling actually, and that because they do not see gambling reliable but as luck.