The thing is, if I see a seller's got one thing listed way out of this world as far as price, I assume that the rest of their product is likely also out of line. (No research, greedy, etc) That's not really a good business model.
Sort of like bad names for companies. In town there's a shop (I haven't figured out what their focus is) called "crap to cash". They are -not- a pawn shop. The name doesn't entice me to shop there.... And the one Singer treadle they had there was a frankenstein of some sort and beat up - priced at $350.