Yeah, I always felt that the images would have to be pretty rare for the buyers to spend time bidding on it. We live in a very 'now' society and people prefer not to wait for something if they have the choice. I had a sale on Clustershot a while back, where it was set between $100 and $150 ( I can't remember), but it was set at 'accept offers'. The buyer just bought it at full price, without making me an offer.
As for Cutcaster, I think they have the right balance now.