well, first you need the talent (and marketing savvy) to attract that sponsorship, then you need to try and keep up with guys like Pastrana, Block and Antoine L'Estage...no wonder Mirra was a bit at the raggedy edge.
also, pleeze look closely at the photos and notice strange blackish marks in the snow. that's glare ice under there doods, ie ZERO GRIP ok? good luck walking on those roads, much less driving em flat out.
if any of you could keep pace with those guys and not hit stuff, more power to ya.