Onyxa is correct, I just did this on my rogue a few days ago.
EDIT: @ErIch, You don't really get 80kg/hour. It just depends on how many people still need the daggers, which is a declining population I'm afraid. Plus, factor in that the person you pay is probably splitting it up amongst the other members that are in there.
I believe that if you timed it right 2 rogues can pickpocket in the same time. 2 rogues from guild i play did it, Just make countdown timer and at 0 all click pickpocket.
This still works btw, maybe not as easy as before but i still see rogues LF pickpocket.
trash respawns after u exit the ins :s
good guide