Pinnacles park is like 60 dollars a night. I bet I could get a hotel nearby for cheaper. It doesn’t scale either for the season. I went to camp at a lake and recreation charged around 50 and the campsite was 20% full.
Pinnacles is not too bad a divergence, though - worse is Point Reyes, where a campsite costs $30 a night, but it's very close to San Francisco, and a hotel room would certainly cost hundreds of dollars a night. And Point Reyes is terrible for people reserving spots that they don't end up using.