how long do regular workers stay on average at a company? 7 years is a pretty long time

Most regular workers leave generally it’s on their own accord. When a corporate CEO leaves, it’s generally because they are fired.

If I am working for a company where the role I am in has a statistical likelihood that I will be fired in the near future, I am going to take every comp dollar I can get and not offer any compensation sacrifices for optics sake.

For some people, enough money is enough money and you start to think about your legacy. Or maybe your coworkers that toil for so much less. Will another $200m make any difference at all for someone with that kind of money?

Those people don't end up at the top mostly. You need a unending thirst of money and power to make it as CEO of Google and stay there. The same happens in politics actually.