People have become accustom to bargaining on CL. So I think most everyone lists things at least 25% higher than they expect to get.
I learned this through selling a couple of item. I put a low/quick sell price on a couple of IPhones, even though they were a good deal, people just would not pay they asking price.
Resisted them later at a higher price, let them beat me down and ended up getting more than I originally listed them for.
From my experience, if you listed a $100 bill for sell for $75, people would offer $50.