People will learn. WoW defaults to a price and people don't list stupid stuff that often. At least not on my server. I would prefer the defualt price to be blank. Then a person would (you hope) at least look at the lowest price. I would imagine the huge undercutters are just saying sell and okay. When I undercut its by 1gil. Unless I think the value is inflated and I put my stuff up at a happy medium.