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and in terms of professional gamblers how do you define professional gamblers with ordinary gamblers? what do you mean you know a professional gambler but have a job or business and gamble just for fun?
It is always a good guess, but it has a legal answer, I don't know about your case or region, but there are countries where you must define what your main income is, since this has legal implications, like which? well, one is to pay taxes, another is that the prizes won by chance are not directly inheritable, you must stipulate it in legal terms, etc.
So yes there is an important aspect in the sense of being a true professional gambler, but even for those who are not interested in that aspect, if you can pay your main bills that makes you a professional gamer.
Joe Hachem (Australian) won a millionaire's prize at Las Vegas and they were charging him taxes, when he returned to his country and he avoided paying them when he mentioned that his official profession was another, something that he was able to verify.
Pero today, his profession is poker player.