Just about every mooring "ownership" I've been associated with, has strict limitations regarding the transfer of said owner's "certificate". In the Narragansett bay area, I have yet to find one that can be legally transferred outside of the original owner's family. This is based upon some very long waiting lists for moorings - especially in popular harbors and coves.
What you actually own, is the right to place a mooring in a designated spot - determined by a local governing authority. You do not own the ground it is planted in. Additionally, (around these parts) the
anchor, tackle, ball and pendant, must be purchased and maintained by the owner. Typically when a mooring certificate expires or is terminated, the harbormaster cuts the chain. A new
anchor and gear is then installed.
The rules where you are located could be entirely different.