There is also the technical aspect of mtb that I don't get with skiing. I love cracking a beer and setting up in my garage for a few hours to wrench on my bike. I love geeking out over new tech and putting together mock builds of bikes that I can't afford.
Plus, the DH World Cup is pretty much my favorite sport. Love getting up on a Sunday morning, cooking a killer breakfast, and watching the race.
Bikes fucking rule.