Fack. I hated to quote that long post but it's all true.
FACT: at a decent sized race at Leerjak (still Planet Sand then I think) they had hundreds if not a 1000+ of people at that park that weekend Riding the 2000 acres of trails, camping in the nearly 100 campsites, etc. They have several bleachers on the spectator side of the track. I don't recall more than a handful (if any) that cared to be there at bleachers. The Stamper guy ran 3.06@106 (yes, he was wearing full leather suit, etc) and I'm not sure anyone was even spectating or cared (besides racers) when he ran that. That park is always full, and folks would rather play in the mud or on the trails than watch us race. Now if it was recorded that may be a different story, but as mentioned there is SO much down time due to track prep. Way more time watching the water truck, tractor, box blade, etc., than racing. This is the reason no one watches (and no media) I believe. Not the above mentioned safety issues, as windy mentioned.