Ok let me come at this from a different angle. What if everything sold by the gunsmith came from players who sold him unwanted decoded engrams and weapons they had outgrown. So you don't disassemble guns you sell them or trade for parts. Is that unfair? Now, for people buying the guns, they would make the payment for the weapons of rare or above with new types of bounties, marks and material other than glimmer and instead of that payment going into a blackhole it goes to the player who delivered the weapon to the store. Is that unfair? Cheating? Now there will be a problem. If every transaction concerns a unique item and this is occurring worldwide you would not be able to keep up with the rate of turn over in the inventory. Good, unique weapons would appear and disappear from the menu too fast too purchase. It's too much, too fast. This is the case until you break up that inventory into smaller groups so that only few dozen players see the inventory of a few dozen players at any given time. But how do you divide people into groups? How about by voluntary association a.k.a. clans? Now players provide stock to their own community with grinding and people buy with grinding.