Probably half the items I have sold have been at my asking price, while the others were still in my low range estimate. I try to list them at a price which I think reflects their value. Some items have sold really quickly & I wonder if I listed them to low. I rather think ...there aren't many of them & so someone was just waiting.
A few items (mainstream items) seem to bring out the low-ballers ....when I sold my B&W center channel. It was fairly priced & I received several offers, but the first 3 buyers were all flakes. I also had a bit of difficulty selling my cd player this summer. I don't think I would sell an expensive item during the summer again. One potential buyer kept on trying to telling how cd players were doomed and why his price was good. I decided not to sell it to him (constant emails) & just waited it out.
When buying items, I pass over items that are unreasonably listed. If the discount is not significant from a dealer why bother. I think all of my purchases have been within 10% of asking (net dollars). I also won't pay PayPal fees (nor do I charge them). Its matter of principal (the agreement w/ PayPal states that fees cannot be passed on to the buyer). I also stay clear of adds saying "low baller will be cheerfully ignored, etc.". Its just rude. I think they can find a better way to word an ad.