I think the the amount of skill vs. luck increases the higher the stakes are. In high stakes games, you shouldn't lose much when you have the best hand pre-flop as other other players will fold to your raises and a lot of pot wins will be blinds. In low stakes, half the people at the table are in on every hand because it's cheap, and great hands pre-flop can lose to 3/9 off suit, which should have been folded pre-flop, but probably won't be if you're at a penny table.
It's easier to predict behavior in higher stakes games as play is more conservative. You don't have people going all-in every single hand.