Um,
pavement aint nearly as fun, destroys tires and engines.
Hmmm where am I going race maybe dirt with having to go sideways and slide jobs and a real chance at passing slower cars or the pretty much fall in line don't get sideways of the asphalt car, hit all your braking marks type stuff. Yuk. Around here we always thought the pavement guys just don't like to get they're cars dirty.