After reading your article and looking at the site, I think you might be pulling the plug too early. I have been in the same boat before. You spend all the time

After reading your article and looking at the site, I think you might be pulling the plug too early. I have been in the same boat before. You spend all the time to build something, you believe it's got legs and then....radio silence. Then you get some interest but it never really takes off. I would bet that if you really talked, like physically talked (phone, Skype) with your users, especially those who haven't been active for a while, you might start to learn more about what you need to do to gain more traction and develop the product further.