Considering that most of the Dramatis Personae carry maybe 5-10 thrones, I really don't see how any group of pcs would manage to be treasure hunters in Dark Heresy, unless the GM allows it become like that. (Please don't take this the wrong way, I'm respectfully chiming in Adeptus-B!)
My players strip dead NPCs of everything they have- specifically armour and weapons- to 'sell in town', D&D -style. I've tried to shame them out of it, but, short of violating the First Rule of Game-Mastering ( never tell your players "You can't do that!"), I don't see any solution other than eliminating coins from the game...
Not sure how you handle your selling exploits. Could you describe them for me? I'll describe mine
I have my pcs roll an Inquiry test (modified by circumstance) to find an interested buyer. Using the Barter skill, the prospective buyer/seller would roll an opposed test to undermine, overcharge, or otherwise best the pcs (and perhaps swindle them). Deal is done after that.
Proscribed items, things that belong to the Adeptus, and other trinkets that wouldn't normally garner attention from the masses would be encounters on their own, and come with a narrative hook that simply might cause the pcs to draw attention to themselves (Arbites, Mechanicus, etc, etc), raise the metaphorical klaxxons and alert the baddies (thus making them disappear, or get armed up in preparation).
Ultimately, I don't get a 'dnd-style' looting spree going on. Plus, rear up your old friend Encumbrance at appropriate times to keep it that way (oh, weighted down? How's some nice water to fall into...)