Sell used books online, sure why not! The quaint store in France where my son used to visit, with its rows of antiquarian books, beautiful benches and atmosphere can be duplicated on a dynamic web page, transporting you to some place special, the same special cafe, the emotion of staring as a mountain in Greece, or the grandeur of Russian architecture.
All of this emotion can be duplicated if your website is rich with graphics and feeling. The user experience is much the same as actually being in the place he or she imagines. Yes you can sell used books online, or buy back books using a virtual marketplace, fulfilling your orders in the comfort of a spiffed up garage you transformed into your companies mailing room.