I can put up my forum as collateral, it has 430 + members and gets 30k unique views a month. Its worth about $2k.
Maybe I don't know everything about transferring forum ownership, but wouldn't that put all the 430+ members at risk of losing some of their private data to whoever holds the forum as collateral? If they don't have full control of the forum, then it's not a good collateral. If the DO have full control, then there's potential abuse. It's one or the other.
Maybe you can fill in the gaps to my understanding on this matter.