Allow me to rephrase things.
Who with the wherewithal and benefits elsewhere would try for professional gambler, given how little you guys let on about it?
A cursory Google search for professional gambler yields as little. Something about successful gamblers like Thorp - who didn't actually make his money in the casinos. Surprising number of those guys ended up in jail for a few years. And, after a short blurb about it, to try this and that online casino to become a professional gambler. A few people claim that thus gamblers do exist, that they personally know not one, but several. Hmm. Not a lot about it on either of the gambling forums, let alone this one, except that professional gamblers, by definition, aren't supposed to talk about it. Go figure. At any rate, the steady parade of supposed professional gambler failures, in living technicolor. Even if, say, Crimm makes $500 a casino visit, I would hardly consider what he has to do to get it (constantly on the road alone, without retirement) worth it. And, again, there's the recent, KJ, debacle, still prominently on everyone's palate. The Wizard, with all of that supposed gambling knowledge, turned out to be the biggest thus joke of all. Still stuck daily on his (former) shithole of a forum. Yes, Romes is still there.
In conclusion, all of it still very much sounds like you have to know a guy who knows a guy, likely en route to yet another "rabbit hole" ... just to begin to find anything out it, what you're supposed to drop an already decent life, with friends and family, for. Doesn't sound a bit odd?
"Down the rabbit hole" is an English-language idiom or trope which refers to getting deep into something, or ending up somewhere strange. Lewis Carroll introduced the phrase as the title for chapter one of his 1865 novel Alice's Adventures in Wonderland, after which the term slowly entered the English vernacular. The term is usually used as a metaphor for distraction. In the 21st century the term has come to describe a person who gets lost in research or loses track of time while using the internet.