Very interesting topic. Tell me im too old school however I still believe that gambling is still a win of luck.
Similar with trading its not always a winning trade even though you are a professional trader.
Luck will always play a factor in everything we do and that is even more true in gambling but make no mistake there are some games in which your skill can affect the outcome as well and it is in those games where professional gamblers make their money, but before you or anyone else tries to become a professional gambler you need to understand the difficulty of it.
While I do not have stats it is safe to say that the majority of gamblers lose money when they gamble and one of the most important factors is their lack of control, as soon as they lose they begin to bet more in an attempt to recover their money and this only makes them to lose even faster and professional gamblers are experts at controlling those self-destructive impulses.