Last year at the RV show we 'won' 10 days of camping at a local 'resort'. It's affiliated with ROD and AOR.
We bought in for essentially $500/ year- we'll see how it goes and each are of course different. We get unlimited camping year around at our home resort but we don't get a dedicated space (free storage area though). Everything is free there - pool, miniature golf, tennis and more - with kids this can save a bundle!
We can stay at one of the two (ROD or AOR, i forget which)for free and the other is $9/night. Other minor benefits is 24/7 security and gate at our home resort, adult lodge with tv, pool tables, a/c, (no kids), a seperate kids building (adults I suppose are allowed). Not having the same dedicated spot has it's pros and cons - you're not stuck with a PITA neighbor.
We spent a week at Gettysburg last year and paid $54 for out site...for the week. Many of these other resorts include free activities as well.
From our 3+ years camping at various 'public' campgrounds we've found there to be more of a 'membership' feeling to the resorts, more care about how folks behave (is that a PC way of saying it?). Can't say the resorts themselves are much different than public / state / KOAs.
If you're full timing it then by all means look into it. We stayed next to some newbie FT's from alabam (at gettysburg) and they're traveling all over the US without paying a single nights camping costs!
Jill & Chris, Wills (14) Evie (11) & Toby our collie (5)
2011 Grey Wolf 28BH
2013 Chevy K1500 Crew w/ Reese StraitLine Dual Cam
Nights camped 2011: 11 2012: 18 2013: 12 2014: 12 2015: 13 2016: 3