Your startup is probably not changing, or even improving the world. Your social media killer app is part of the problem, not the solution. And I know Microsoft/IBM/Oracle/etc gave up on improving the world a long time ago, instead opting for "shareholder" value, whatever that is. What good is money you can never enjoy? Your kids won't thank you if they don't even know who you are and have never spent time with you. Exhausted evenings don't count.
I have chosen door number 3. I live an ultra-frugal lifestyle and am already planning an exit from my day job in the next decade, to retire before 40.
People like Bill Watterson, Cory Doctorow, and Richard Stallman are on to something. They are actually enjoying life now - Are you?