+1 I was working in my cushy corporate job while my cofounder (also in the same company) and I tried to get our startup going on the side. Eventually I realized that I just didn't have the time to be successful at both and I had to make a choice. It's been over a year since I left and the learning experience alone was worth it. There is so much work and problems to deal with in building a successful startup that unless you're willing to devote yourself 100% to it, you're not ready for it.