I went into a private CG on the Oregon coast that used to be very popular due to the location. It was kind of run down and a developer(for lack of a better description) bought the park and UP GRADED it and sells, leases and rents spaces. The cost was several times the cost of many coastal parks including CA.s $65 a night parks and all they did was paint, landscape and lay new crushed gravel on the road and sites. They do not discriminate against any age rigs only against folks who can't afford to pay over $100 per night.
It was the most expensive CG we have ever looked at and the prices keep the Riff Raff like Sharon and me out.
I think they are very unusual and not all that much. Ft. Stevens and many others will even deliver you firewood to your campsite and many other neat things, it's pretty darn inexpensive too. They let us in and just about everyone else.