oooh, used care salesman-like abilities. sell cheap hats that degrade over time or with damage taken by the player. lower level items would degrade and 'break' quicker.

the car salesmen would know the real ql of items but customers would only see special and not know whether they got a q200 or q1 item. a couple hours later some one would be screaming 'that guy sold me a lemon!!!'.

i like it.