Because they're oakley. People love the O and the image/prestige associated with it. I'm not hating on that either, its just the truth. I've had 4 pairs of crowbars, then i went around and started trying on every pair of goggles i could get my mitts on and I found a pair of scotts that i like much better. To each his/her own though.
Also, who wouldn't want to be like tanner, seth, simon, jon, etc.... They're pretty amazing. It must be the goggles.