But they are only few compared to losers mate.
It's true because that's the nature of gambling, only few are winners and majority are losers.
That way the casino business can operate profitably.
and also they are the people can be called Professional gamblers because they uses gambling to fed their family.
Professional gamblers are those who gambling for a living, but it doesn't mean that they will be profitable all the time, it still depends on their skills.
Just think this way, not all professional gamblers are winners as well, but they are serious without gambling and they are gambling with a decent amount.