Jerry,
I was in PSL a few weeks ago and met up with Ed Saylor. He had purchased several lots in their Phase II as an investment. He believes that when the "baby boomers" retire they will embrace RV travel. Like you discovered these "first class RV resorts" will be attractive to them. Whether they will buy or rent remains to be seen.
I suppose you will have a 50/50 mix of owners and renters like you would in any other development. I looked into buying a lot in PSL a few years ago, and I decided that the monthly maintenance fee and property taxes would negate any price appreciation. So I have just decided to rent rather than buy.
An advantage to renting is that you can visit different areas rather than going to the same place all the time. I have never found a resort to be "Full" when I wanted to stay there. Most of them are building additional phases as soon as the first phase is complete. This of course will put downward pressure on prices of existing sites so the early buyers rarely enjoy big gains on re-selling their lots.
In the case of the French Quarter RV resort it is small (52 sites) and can not be expanded because the land is not available. That might be a good place to buy instead of rent. I would imagine that it fills up quickly for Mardi Gras, Saints games, etc. I have only stayed there a couple of times and didn't have any trouble getting in.
Tuga & Karen Gaidry
2012 Honda Pilot