There are 171 people wealthier than Elon Musk. If they all did as much as he does, we'd have audacious, world-changing ideas being announced every couple of days.

EDIT: There are some great, level-headed responses and viewpoints coming through. I'd like to clarify that I'm not saying Elon Musk is some kind of hero, or that none of those other ultra-rich people are doing good (Bill Gates, Warren Buffett, the Google guys etc. spring to mind and are obviously doing great things for philanthropy and technology).

I was simply trying to provide a bit of perspective on what could be possible if they all had that attitude. Lookin' at you, Waltons.