One thing I've learnt about inveterate gamblers: they only ever tell you when they've won!
That said, and purely by chance, the last four (London, Vienna, Vegas x2) serious visits by me to a casino (in the last nine years btw!) have ended up in me winning several hundred pounds on each occasion. It was roulette on three of those four occasions, so I'm not going to be so arrogant as to suggest that the outcome was down to anything other than luck. I usually put money on 7 & 13 and I was in the right place at the right time. It's a mugs' game, if you ask me.