Yeah even if you can't see the listing price, you'll still see what people are buying it for. Which is usually the cheapest they can get it for. That wouldn't change anything. And people don't HAVE to undercut just because one guy does. If 6 people think their item is worth 35K and one guy who wants to sell his quick lists it for 10k, let someone buy that one at 10K, and then when there aren't any more 10k items left, people will go back to deciding if they want to buy at 35k because thats what is left.