I am not surprised it is so overwhelmingly PC. Most titles that this forum deals with are PC titles. I also noticed that most of the console users in this forum have registered since F1 2010 launched.
Console is a great option for a lower budget, but if racing games/sims are you main form of entertainment and you can afford a good gaming PC, consoles simply can't compare. (I do own an Xbox but would never buy a racing title for it).