This sounds very similar to my history. I've built a number of projects on the side, one of which my current employer purchased for a decent sum of money (and then hired me). I continue to build projects on the side, but I just don't have the necessary time to commit to them.

I finally bit the bullet last week and put in my 2 week notice to work on side projects full time. I have enough money to cover myself comfortably for several years, and I have no dependents - this is an opportunity I may never get again. I'm giving myself 1 year to see what I can build, and then I'll decide what to do.

Worst case I go find another job in a year.