Google agreed to dish 48m, in retention bonuses. There about 100 employees, so that averages about 480,000 per employee. Not sure what the vesting period is, but assuming it is at least 2 years.
Not bad, but not life changing either. After taxes, you can afford the downpayment of a Condo in SOMA + a bit more, or buy a small one bedroom in Mountain View.
Moral of the story, if you want to be rich, start your own startup.