I mean he has nothing else doing apart from gambling and yet he is leaving well and comfortable.
This surprises me. As much as I don't want to believe that people like this exist, but the other side of my brain is telling me it is somehow "achievable", only if you have enough connections and possesses something or someone that the an ordinary gambler doesn't have. Otherwise, everything seems close to impossible, especially when you said he's living decently and comfortable. This story is a direct opposite of the common story in gambling about people who've lost their wealth because they excessively used their money to bet.
I also saw a documentary on social media about a professional gambler who is a sports bettor in Las Vegas. He shows his mansions, expensive cars, and a lot of dollars in his house. He claimed that it is simple to make money from gambling, particularly in Las Vegas. He started with $50,000 and worked his way up to $300,000 in just three days! I am amazed. He really has not disclosed on what sports he is betting, but he just said that in sports betting, you will win big if you bet big, but the risk is that you will lose it all if you lose.