I am kind of tired of reading stories of people who have left Google to launch fantastical enterprise X. And this particular story has been covered here before, I think.
I left a big company (not Google) to persue my own startup and fucked it right up leaving myself in debt for 5 years :)
The sickening bit was to offset the debt, I sold the codebase to another company which did quite well out of it. They offered to hire me in but I couldn't face it.