This kind of happened to me. I've tried building serious apps with limited success and traction. I'm a huge reddit/imgur fan so a built a hobby site for myself using reddit's api to browse through their images: http://www.flipmeme.com. Currently gets 100k uniques per month, can't monetize!!! In other words, the stuff you really work on doesn't get anywhere, random stuff you build as a joke suddenly takes off?!