I honestly don't think market-bias would be a bad thing. For the vast majority of players, they're not going to care about the signature on their gear. People have to check you in order to see them, and it's such a minor little thing. That said, this DOES mean that someone can attempt to use whatever fame they've acquired in game to market their goods, and this is arguably a good thing. It adds a new social dynamic to selling your products. Also, on the flipside it gives players an incentive to not buy from players who are infamous, which means another little reason not to be a dick.