NPC-able Items

[Kristal]

I was simply picking an item at random to make a point...

What point would that be? Guild NPCs already do what you ask, and some items have such low priority on the AH that it's easier to just walk out in the field and bonk some birds on the head yourself.

Might as well give each regular vendor NPC a small history of sold items, so they can sell random stuff for a profit. (Older items get pushed off as items are sold to them, and server reset clear it.)