You've encountered someone who claims to win more than lose? Poppycock! The house stays sharp throughout time. The "huge amount" you claim to win occasionally is the universe offering you a bone to steal later. Perhaps it's the bright lights or the free cocktails, but your gaming knowledge appears distorted.
Although everyone has their own experience, only the discriminating gambler can separate the wheat from the chaff and understand the casino business. But what do I know? You may be correct and everyone else is in another world. Unicorns and rainbows till the house takes it all. Your acquaintance is an intriguing abnormality; a lab could study him.