I remember when rustic sites in Michigan parks were $7 a night. Now, they are over $20 if you want to reserve ahead of time, and that gets you pit toilets and a hand pump water supply (and remember not to sleep in the site that has the hand pump, unless you want to hear it creaking all hours). I'm not even that old.

I'm a big advocate of doing tent camping Europe style: a grassy area that one pays a set cheap rate for, and pitches anywhere. No designated sites, not exclusive use firepits. You can always add more campers if you hit a busy time, and I don't have to pitch my tent in a virtual trailer park.