That's more likely a gambler's mentality. A gambler would usually play despite of the fact that winning is not certain. Once an individual experienced winning, regardless of his losses, he would continue and urge to again experience 'that' experience. Only few gamblers are being able to save their winnings, most of the gamblers are again using their winnings to play and eventually it would consume more. It is a matter of discipline. If a gambler won't control his self, such scenario would be the outcome.
It is not as aeasy as it sounds. From how I understood gambling habit, the bigger your winnings are, the more you would play and engage your money in it. It can be associated with psychology, in particular with learned rewarding system. A habit perhaps, would be sustained through rewarding system, reward in this case is winnings, and the habit is playing more.