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If it were just luck, then everyone would be expected to break even after playing for several hours. In fact, those with the skills walk away with all the chips.

Poker requires several complex skills: reading body and facial language; masking your own body language; assessing probabilities; weighing risk and reward; game theory (i.e. knowing when a bluff could work, and when it wouldn't). In addition, it requires an ability to control emotions. Anyone, who does well playing for matchsticks, but always loses when money is on the table, knows the importance of controlling emotions.

With the ability to count cards on multiple decks, Blackjack also becomes a game of skill.