I'm still waiting for someone to make a complete list of all loot buying npc's with all the details of who buys what and for what amount.
Also just a thought. It might be cool if one of the 6 npc's (at random) that buy loot was offering double the amount for particular random loot items each day or perhaps weekly if its easier. Just like the witch does for bugs. I know its not necessary but it might be a nice way to slip a little extra gralats into OUR collective pockets.