Quick question about the new champ

"See, I got hungers that ain't easily fed. But those finest tables? They ain't never got a seat for me. So I need men, like yourself, and let me in."

Now the Gambler's only hunger was dice and cards. So this bargain? It seemed too easy a price. "If you're offering a ticket," the youth finally said, "that's a deal I will take."

What does Tahm exactly mean he needs people to "let him in". The world? If so how can the gambler even find if not see him?