The reason you wouldn’t work elsewhere and invest is the following: you get hired at Amazon with a total comp of 500k (180 base + 320k in RSUs). You have been in role for 2 years and are completely burnt out. However the stock has doubled, and your total comp (without any raises) is now 820k. That is too much money for people to walk away from. If you leave for GOOG you will get in at the current stock price with no guarantee it will double effectively taking a pay cut.