It's probably not doable, but I'd only be in favor of them being turn-ins if the only ones you could turn in were non-combinables (smith) and (tailor) footwear & bone.
Either for all BODs, or for only a select few categories being turned in, Value could be based on the BOD point system (say, divide the points by 25, rounded down). That way, cloth, leather & iron normal BODs would be worth 0 to 2 points (and those at 0 are worth more selling to people turning in junk BODs for more BODs, than to turn in, anyway).