Well, in some ways we might be able to say that these people are professionals gamblers rather than addicts. They might be addicted in a way that before they had gotten to that level where they are now called expert in gambling, they must have been a stage in their life where they did anything to make sure they could gamble. The word addiction can been seen in so many aspects but it would be more appropriate to use it when someone can no longer control his gambling habit and gamble without season. A responsible gambler who turned out to be a professional might be because he understood the consequences of going rouge and made sure he stay on the right path.