There is a segment of the Couples Resort clientele that goes there strictly due to the fact that they have AN facilities and a lot of these visitors are repeaters, at least that is what I have heard from some of their managers. If they were to stop offering AN it would be felt at least in the short-term. The typical Couples AN visitor enjoys the AN beach experience but does not consider themselves nudists nor do they want a 24-7 nude experience and they enjoy a somewhat upscale vacation experience.
As far as the comparison between N and Hidden Beach is concerned, that is apples and oranges in my book. N was very rustic while Hidden Beach appeals to the more upscale traveler with price points to match.
I have not been to Orient Beach so can't really comment on that.
The one thing that does seem obvious to me is that the market for AN is very fragmented as in family vs. adult, upscale vs. more rustic and the AN market is just not big enough to support a large number of resorts that can cater to the subgroups in the AN marketplace.
Most younger folks aren't interested in paying to go to a place where they will be bored out of their minds with nothing to do. Then as soon as they whip out their phones to text, kik, Facebook, tweet, whatever with others they are pounced on for breaking the outmoded notion that they will let out the secret of who is there (signaling that we're supposed to be embarrassed to be there). So even if they did have something nice to say about the place they are prohibited by club policies from striking while the iron is hot. To say nothing of the Victorian rules that many places still post that punish males for being born male.
Basically the generation running resorts are out of touch with current trends and are shooting themselves in the foot. So go their campgrounds and resorts that they own. They want to hide away from the world so they got what they want.
The Florida Young Naturist gatherings at Sunsport packed in a hundred or more young people because they were organized by a group of 20-somethings. They had live bands playing current music, a huge inflatable water slide which is perfect for when you're nude, yoga classes, volleyball games, and basically offered more than shuffleboard and sitting around a pool all day long. They also kept the cost low as many could barely afford the travel to the event, let alone camping fees.
Ask your target demographic what they want and they will tell you.