Wow!!! Those sound like the rates when we started, back in 2004. One nice, private, campground up in New Hampshire which we get to when we can, used to be about $40/night including 4 kids and the dog for a site overlooking the lake and full hookups (50A). Now it's a bit over $100/night.
In addition to the base rates rising, it is becoming increasingly common for campgrounds to limit the base rate to 2 adults, or 2 adults and 2 children, or some such. Additional daily charges apply if you have 3 or more kids. Dogs are extra at some campgrounds.
I'm not blaming them, they have to make a living and here in the Northeast, it's a pretty short season from May 15 - Oct. 15, usually.
I agree that if one tries to "save money" RV'ing, it's going to be a struggle. It's a lifestyle. It isn't for everyone, but those who love it know it's worth every penny with the memories that are made! :-)
~Rick
ON EDIT: It just hit me....what the heck does J.D. Power know about Camping and RV'ing? Apparently not much. LOL