Regain your own time. As a former CTO who has recently exited, recovering my own time again is more valuable to me than the money (although the money means I can retain my own time going forward).

> His life has meaning, he’s of value to his employees and customers and partners.

Your work is not you and if you think that way, you're gonna be crushed when you come to retire. Even though I loved what I did for a career, it's better to do what you love for yourself, not "employees and customers and partners". Many people have other interests outside of building tech, but even if building tech is your only thing, exiting is a chance at starting something fresh and on your own terms.