One of the idiocies if "Let the system decide for us":

"If there's a lack of feedback, we block bidding by that person so as not to waste our time."
Well, isn't that wonderful.  Apparently this includes "If you haven't bought a bunch of stuff, so you have very little feedback, we'd rather not be bothered with you."  Which is a great way to not get the money someone wanted to trade for your item.