I had TT membership. It was not bad when I joined.
It had a fixed price. No increases ever. Well that was true enough, but they kept adding supplementary charges for maintenance (wich was supposed to be included), electricity, etc. etc. The "extras" became more than the annual fee.
Then they sold it. It has passed through a series of owners, each worse than the previous one.
The site we used to like going to changed significantly. They started building huts on it and renting them out to anyone - not just members.
Then they allowed people to pay a chunk of money and "own" a particular site for a year or more - so all the nice spots suddenly had chains across - empty, of course.
For us plebeian ordinary, old-time members, only the less favorable spots were available year round.
There are rumors that in many cases, they are working at getting zoning changed to shut down the camps and build sub-devisions on the property.
I terminated my membership, and didn't even try to "sell" it.