psyduck said:
Well, if you have skill and skill is a big factor, shouldn't you win regardless of the format?
It might help to consider the amount of trials in each. In tournament poker, I think you can expect at least 30 hands per hour (I'm estimating), and say a big pro plays 4 days of 12 hours each before busting out. Not even accounting for breaks, table changes, etc., that's only 1440 hands. If you're playing blackjack at 100 hands per hour, that's less than 15 hours of play. Have you ever had a bad swing in 15 hours of play?
It's not completely analogous, but you get the point—many major tournament pros only cash in a few tournaments a year. The WSOP Main Event is only one of them. Tournament poker variance is much higher; you play many tournaments that you don't even cash in, but when you do, you cash big, offsetting all the buy-ins lost in tournaments that you busted out in. Yes, if you're skilled, you'll win in the long run, but that doesn't mean that you'll cash in every single WSOP Main Event.