I am in the point system with Diamond Resorts. I have been told by them that the points can not be transfered if I sell my time share. If that is the case, it has no value for resale. Do I understand this correctly?
To start you need to understand that membership in DRI's Club is separate from owning a timeshare.
To be a member of the Club, you have to an "ownership interest" in a Diamond Resort. But a person can own at a Diamond resort and not be a member of the Diamond Club. "Ownership interest" will be either a deeded ownership of a unit at a Diamond, or a partial ownership in one of DRI's ownership trusts (or "Collections", as Diamond calls the trusts).
With that distinction in place, your membership in the Club is not transferable. Your underlying ownership is transferable. So what happens when you sell your timeshare is that the buyer acquires your ownership interest in a Diamond resort, but that ownership is no longer connected with Diamond's Club.
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What that means is that when you sell your timeshare, the Club benefits do not go along with it. So the buyer can reserve and use the basic ownership. For example, if the interest is a deeded week at one of the resorts, the owner can use their ownership to reserve a week at that resort as a normal owner. If the ownership is an interest in one of the Diamond "Collections", then the owner can reserve units within that Collection.
What the owner can't do is use that ownership to make reservations at other Diamond properties that are not part of that ownership interest.
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In sum, you
can sell what you own and the rights that go with that ownership. You
can't sell the Club membership, so the added benefits that are unique to Club membership are not transferable.