There's a difference between playing a game for fun and playing it competitively. And sure, some card games are played competitively. Poker had a boom in popularity during the last 10 years despite random elements. But a game of poker isn't decided after a few hands, so players get roughly equal hands averaged over the long term. And because players have direct control over the stakes of each hand, Poker is ultimately a risk management game. A game with less risk management such as Go Fish has less viability as a tournament game. Coin-flipping has no chance as a competitive sport.
Smash Bros is also a risk management game, because players have imperfect knowledge of their opponent's future moves. Ideally, competitors only have themselves to blame when they lose. Competitive sets are decided after only 2-3 rounds, so the variance introduced by items greatly reduces the impact of competitor skill on the outcome of the match.
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