With lots of folks playing it seems as though you might end up with bunches of stuff sitting around. If there were a tinkering skill, you could get xp by taking stuff apart. This would reduce it to its components again, but might have a chance of breaking it into other (potentially useful) bits or just plain breaking it into dust. (Which could lead to an interesting dust problem with xp awarded for watering dust to turn it into a patch of mud, which might dry into a patch that could be tended or which could be wallowed in by pigs...)