Maybe it is the urge of that individual to earn profit 'easily'. It is no longer the experience which makes a gambler that much hooked up in gambling, but their hopes of winning big time. Reality check, it is hard to earn money nowadays without working hard. And given that there is a tendency for an individual, perhaps a gambling addict before who have experienced winning, to earn the money one is working for a year, in an instant, that might be the main reason why a gambler would come back in such activity despite of the risk.