Fair game, I say.
First, the seller can set the starting price for the listing, and may be able to also set a reserve price. This allows a seller to set a minimum price for which they are willing to part with the item. If a seller chooses to set a low starting price and or no reserve to try to drum up more interest, that is the seller's decision.
Second, if the listing contains spelling errors, or the pictures are poor, or etc., and the seller makes less money on a listing as a result than they might have if the listing were better done, who can they really blame but themselves?