I've had the same issue. I built a web based cash register / stock tracking app for a customer a few years ago with the belief that there were hundreds of busin

I've had the same issue. I built a web based cash register / stock tracking app for a customer a few years ago with the belief that there were hundreds of business operating in her niche in a small, easily accessible area. She loves it - but nobody else has the time of day for it. Learned a hard lesson about market validation there.