Go away, it's mine

Prices in trades are about exclusion. 

The difference between market exchanges and gift exchanges is the anonymity of the transaction. The market exchange is between strangers while the gift exchange is between familiars. The market price pays for the cessation of the assignor's claims to the good being transacted in. The buyer gains exclusivity. The buyer doesn't have to know the seller at all for the transaction to make sense. 

What the buyer gains in clarity of title he loses in possibility of relationship. The introduction of exclusivity ("Go away, it's mine.") eliminates the possibility of stewardship and collaboration. The elimination of stewardship and collaboration undermines the creative act. One of the necessary requirements of genuine creativity is the conviction on the part of the creating agent (the creator) that he or she will be a party to, and be able to participate in, the creature’s subsequent sustenance. Cut off the ability to participate in the sustenance and you amputate the ability to accomplish the initial creation in the first place. 

Any creative act whose ongoing engagement is foreclosed is a warped creativity, and it is easy to imagine how it could stop the creative act altogether. 

The creator and the steward need to find each other in relationship and to engage in a joint claim to the care of the creature in such a way that one's involvement does not exclude the participation of the other's involvement.