40+ pages of discussion and everyone agrees on one thing; there are some people who does it. But nobody really gets into detail of it.
Maybe because True gambler don't Love Drama ,and it's not their Forte to Post and tell Stories in which they don't benefits at all.
Maybe unless they will be offered a Book and payments to disclose everything they struggle and succeed silence will remain in their part.
There are two types of people who can make a profit from purely gambling, one of them is the people who gamble on pvp games, such as poker because in those games there is no guarantee you will lose, and if you are good at what you do that means you could profit from it for sure, depends on your talent levels.
Second type is the one who gambles against the house edge, but they gamble on twitch, or any other platform that allows such things, and they lose money in the end but they make more profit from the income of that instead. The one that is guaranteed to lose and can't make a living is the people who wager against house edge, because even if you win short term, you can't consistently make that profit forever.
Literally you have a Knowledge about gambling , These course is really hard to achieve but yet there are successful in those areas.