The question is not, what would you do to make a living. The question is what would you do in your time if you had enough money not to go out and make a living. Many of us do what we do, because we need a monthly pay check to feed us, pay our bills and send our kids to school.
If you had 20 billion dollars, what would be your bigger priorities. Building and maintaining a Php site(which is important too, because that is what got the 20 billion dollars) or Space Travel?
The question is not, what would you do to make a living. The question is what would you do in your time if you had enough money not to go out and make a living.
I think this is completely wrong. The question is exactly the same if you're deciding what to do with your career or what to do with your fortune. Action is difficult, fantasizing about what you'd do if you were rich is easy.