I think a lot of sellers factor in haggle room. For me, I pass these by. I don't enjoy driving an hour or two to haggle. I just expect to find a properly represented machine at an agreed to price.
I think high prices feed high prices. I see a B/C title listed a bit high. A week later another one listed higher. Neither sell, but the sellers think this is the new floor price. I also doubt the veracity of sales prices in the market. When (if) machines are marked as sold, some sellers don't admit they took less than advertised. This also doesn't help.
I rarely sit on a machine for a week or two when I try to sell. If I don't get interest, I drop the price every few days until I get calls.