When it comes to selling your product or service, using a third-party marketplace just makes sense. The wider your coverage base, the bigger the sales, right? Well, probably. The success you find with websites like eBay and Amazon will be based on your familiarity with how the services work, harnessing those services to their fullest extent and choosing the right platform that meshes well with your customer demographics. According to New York Times editor, Kelly Spores, there are a few rules...