In Your Experience, What Percentage of Poker is Skill vs. Luck?

I've actually been wondering something along these lines. Obviously if you're playing SNGs or ring games all day, over even a year your luck component is going to be minimal. But if your only game was giant MTTs, I think it would be possible to have a very lucky or [shudder] very unlucky lifetime. Scary thought.

I'd love to see some math on the variance of say 25 $10k/500ppl+ buy-in tourneys a year. Assuming you are a 100% ROI player (that's about what the very good players expect right?) or a 50% or 0% ROI player. IE - even if I am a dead-average WPT player, what are my chances of having a nice winning career?

Very curious here.