You probably miss a lot of good deals passing on "firm" listings. Sometimes I price something extremely good and I know it. I put firm in the listing because I don't want to waste time on tire kickers and offers I know I won't accept. For example, I just sold a Demo Man for $1,000 yesterday at a "firm" price in 10 minutes. If the seller understands the market and prices something right to begin with, no reason to pass on "firm" listings. Take those blinders off!