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I'm not sure it's the case for all poker/card players. In fact many poker players play because they are good at this game and they win. So they don't play just because of an addiction but simply because they win and they like that.
I agree with you, but the reason for their victories (at least if we are talking about online poker) is not in any special skill. Most "profitable" players play poker using specialized software that gives them a great advantage over ordinary players.