I feel really bad for Hurd and his family. Why work that hard? The 24/7 CEO lifestyle seems like such a waste of time if you end up working it to the day you die. Like, why work that hard? For the family you never see? The vacation home you can visit for 5 days a year? The yacht you leave parked 360 days a year? The job is so demanding and so hard it seems like Mark worked himself to death, literally. He probably cou…
The sheer joy of creation and maintenance. Or, with the mental model of the organization as a developing child, an unruly yet talented child full of promise - raising it up to reach it's peak potential, like an athlete's father, like Tiger Wood's father, might do.
That sounds like a legitimate life work, and a hobby, and an interest, to me.
EDIT: The care-and-feeding of some of my long-running simulations, be they agent-based computational economics, or alife, give me a lot of joy, even after 20 years of watching them and nurturing them and tuning their parameters. (The results are can be quite surprising! I don't understand people who golf or fish, or that retire to do whatever retired people do, but starting companies or herding populations of computer programs is something I could imagine doing until I die.)