What comes to my mind is that this guy is a risk-taker and generally has more risk in dealing with money. The other things are more about personality, genetics, etc., and not about this guy as a gambler.
However, it would be different if you asked me about "what comes into your mind when you see a problem gambler" as you know that gamblers are generally divided into (1) responsible and (2) irresponsible/problematic. So I wouldn't say that guy is useless, but irresponsible/cannot be trusted.