And therein lies the problem of side projects. They will either muddle along as a fun side project and provide a necessary distraction from your main work, or they will grow and demand your attention. They want to be fed. The answer to “what if this fails” is easy. You shut it down. The answer to “what if this succeeds” is much harder. Especially when you’re not willing to walk away from your main job. And I wasn’t.
Moderate success is the hardest kind of success. This is exactly why we got out of our web hosting side project to focus on services and development.