Crothian said:It can hurt merchants. Why do you assume that a merchant automatically know exactly what it is worth, they can mess up thier roll too.
Never seen that before in any game from 1e t 3.5e and other systems.
The merchant just always knows unless you're purposefully trying to trick or bluff him.
Sounds like a nice idea if the group is into playing "Merchant: The Shopping". Most groups I've been a part of really don't want to devote that much time to it though.