And if its voluntary I would more likely categorize it as a hobby rather than work. I think we need a better definition for "work". Work, to me, is an obligation. People work in order to feed and house themselves. So let's says someone has $10mil. That is more than enough to easily live off the interest. I would say anyone at that level of wealth never actually works because they have the option to stop at any time, which in my mind makes it a hobby.