I don't know, but I guess those poker players who are joining different tournaments are considering gambling as their profession already.
I mean I don't have the numbers, but I believe that there are gamblers out there who are treating gambling as some kind of profession already because they're earning on it.
For most, I know it is impossible to make gambling a profession because most of the gamblers are losing money on it, but I've heard stories here in our place regarding certain people who are winning in gambling, and those winnings of them are being used to buy their own home, car, etc. If there are gamblers out there who are taking gambling as their profession, they might be poker players because poker isn't only a game of luck, but there's some kind of mind games on it as well.