Companions have an option to sell trash items from your inventory - I seem to remember getting it to work once in beta (acted like a mission skill - companion disappeared with a timer, came back with cash), but I've never gotten it to work since. My character gets a 'cast bar' (what are we calling them now? skill timers?), and does the 'get away from me' animation, but the companion just stands around, staring blankly at me and my inventory of grays.
Is this broken right now, or is there some condition to it I'm not meeting?