I've camped in state parks for many years, and all I can say about the price is I'm surprised it hasn't risen MORE, considering all the funding cuts. The price is reasonable, IMHO, even for non-residents. The only ones with a legitimate beef are the motor home folks with a toad, getting charged for two entry fees.
It's a matter of personal taste of course, but in exchange for miles of beaches, and thousands of acres of woods, sand dunes, and trails, I'll forego on-site water, and I'll put up with a little sand in the showers. I don't want cable, or wi-fi. I don't even mind stopping at the dump station on the way out, unless there's a lot of bugs...