What you love should be your hobby, but what the marketplace needs should be your business. A business purpose is not to serve you but to serve the market. The needs of the market is priority and not the want of the startup. A product must meet market demands for a startup to be successful, constant inability of the company to meet up with market fit will result in the total loss of the startup. Achieving a high customer satisfaction rate is important, if the startup wishes to remain in business.