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So I don't really think that gambling every day is almost similar to pro-gambling because it's still at a different level and casual gambling CAN'T be considered a real job.
Basically, the more often people bet, the greater the chance of winning and also the increase in the number of losse. Someone who would be said to be a professional gambler is someone who relies heavily on his skill and expertise in gambling, has a mental and style. But all of that will still depend on luck. I just assume that all gambler who are able to control their emotion and manage their finance in gambling will be called professional gambler.
People will have the same chance to win and to lose. But if they continue playing for more, I am afraid that the opportunity to lose will become bigger as many things such as emotion, money, and control will change following their playing. The emotion, money and control will increase, and if one of those things becomes bigger, they will lose control, which is the first thing that can attract them to lose more money. But as a professional gambler, he will not lose that because he can control himself, which will not affect his emotion.