In building a business it’s generally considered a good idea to listen to your customers. The idea is that if your product/site/service is a better fit with customers’ needs you will have more of them. As it turns out though, listening to customers is a lot easier said than done. First, which customers should you listen to? Is it the early adopters or should you try to identify what you believe to be “mainstream” customers? This turns out to be very hard to answer. If you don’t keep the early...