Personally, I hate riding on dusty tracks. That get's into everything.
Sand, real beach sand, you only clean the chain and sprockets, air cleaner, and hose off the bike.
I very much doubt they have that many tracks in NorCal.....or SoCal nowadaze. For sure, they closed off at least 10 tracks in the year's '83-90 up here. And no new ones opened.