[vessenes]

>deciding 'it's done' seems foreign to me.

Agreed. On the other hand, you can never say in a press release, "I'm bored, I don't like managing a company this size, and the politics are sucking all the life out of me."

Corporate inertia is real; I think it's easy to imagine a twice-successful youngish entrepreneur wanting to try again, fix the old mistakes and get back to working with a small team of scrappy folks. Especially when you don't need the money any more; without the 'have-to-make-it' stress, startup life can be pretty fun. A lot more fun than dealing with board-level powerplays, at least for a product-type person.