I am in a similar situation, but attacked it from a different direction. We are almost ramen profitable, and built our company (http://codiqa.com/) almost exclusively while working 9-5 jobs. We'd work 9-5 then come home and work four hours a night, sometimes more. We did that for several months before we launched in February of this year. I don't sacrifice personal time, and we are still growing. Granted, we are young and have very few obligations, but it works. We have never taken on client work, but it's definitely an option should we need to.

The point is, I don't agree you have to sacrifice personal time to be successful. I think it's very healthy to have things outside of work, if only because it makes you do the work that's most important when you are working.

That being said, I probably work way more than I realize, because it's not really work to me.