I currently have a book listed (nothing special, widely available book)- there are loads of other identical ones listed by Power Sellers at a Buy It Now price with free postage but people are still bidding on mine.
To give you an idea you could get it for a BIN incl P&P for £2.75, yet my auction is currently at over £3 plus £2.20 P&P
The only difference is I have included a photo of the book in my listing and the others generally haven't. Do people really place that much emphasis on a photo?