Now for a response that might answer some of your questions. I don't know much about Amber Vacation Club, but I will share what I do know with you.
Amber Vacation Club is a small points based exchange system set up in 1994 by the original developers of the affiliated resorts: Alhambra Villas, Kissimmee, FL; Casa del Mar Resort, Ormond Beach, FL; Oakmont Resort, Pigeon Forge, TN; Sunrise Ridge Resort, Pigeon Forge, TN; and Tree Tops Resort, Gatlinburg, TN. Weeks at these resorts had been sold as a mixture of fixed (high demand weeks) and floating (all others) weeks.
Amber Vacation Club allows an owner at one of these resorts to convert their home resort week usage into AVC points; these points can then be used to exchange for a vacation stay at any of the other participating Amber Vacation Club resorts.
Most of the resorts were sold out when AVC was established, and selling memberships in Amber Vacation Club to existing weeks owners provided some income for a while. Then RCI started their points system, and the AVC resorts switched from selling AVC memberships to selling RCI Points memberships. As far as I can tell, they are no longer selling new AVC memberships. I believe that at one time all AVC memberships included RCI points memberships.
A few years ago the Berkley Group purchased the interests of the original developers of these resorts, and now maintains a minor sales presence at the resorts in Tennessee. I don't know what they are selling - it might be RCI point conversions, or it might be timeshares at Sunrise Ridge, or it might be something else - although we usually get a phone call asking us to attend a sales presentation when we stay at one of our timeshare weeks there.
Although I own fixed weeks at two of the Tennessee AVC resorts, I have never been a member of AVC. Nor have I attended one of their sales presentations. However, as an owner at those resorts I received promotional literature for several years, and invitations to sales presentations when we stay there.