my guess, money.<p>All that brilliant work, will just end up making Sergey and Larry even more rich.<p>Google seems like a great enviroment to learn, but at some point reality bites.  Your 130k salary wont buy even a decent two bedroom around mountain view.<p>1 You either have a wife that makes 6figs, so with a combined salary can afford a two-three bedroom house, + schooling for kids.
2. Try to make it big. That at google aint gonna happen.  Maybe you will get an extra 30k, for your extra work, but that's it.  In comparison, a 7th year lawyer in a top firm, makes easy 260-300k.