Building everything a customer asks for and following the "customer is always right" mantra doesn't seem like a good idea. As Steve points out in his article,

Building everything a customer asks for and following the "customer is always right" mantra doesn't seem like a good idea. As Steve points out in his article, customer development is about better understanding your customer, their needs, and how to sell effectively to them. It's not about giving away software consulting services for free-- it costs a user nothing to ask for a feature/solution, but it costs you quite a bit to build it for them and even more if they're the only user that wants this particular feature or if they're unwilling to pay for it. Tough to know where the balance is sometimes though.