For the recipient, unless the transfer is registered by the registry the recipient has no way of demonstrating to anyone that the address space is now controlled by them.
black market goods which are not uniquely identifiable (think booze) sell at prices somewhat related to free market prices for the same items.
goods which are uniquely identifiable (think famous art), sell at a fraction of free market price because the buyer can not openly admit to having bought them. and further resale is quite difficult.
randy