We live in Coastal GA and summer in NJ. NJ can still get hot, but nothing like southeast GA. Plus our campsite is shady and across from a farm, so we always have a nice breeze blowing through.
Reasonable? Nothing in NJ is reasonable. For us, it is more about being with family. Our kids are 14 and 12. Our campground is less than 2 miles from both sets of grandparents and most aunts and uncles. We pay $4,000 for a 5 month season.
The nice thing about it too is kids are still in school for almost 2 months when we get to the campground. Then it is busy for 2 months and then quiet again for the last month. Our kids are homeschooled and finish up their "school year" while at the campground.
-Michael