Can you be rich, powerful and famous... and still be humble?

Really good questions in this blog I randomly found. Comments are pretty good too, something I'd love to know, especially if I kept going with my Africa Aid stuff. What if I got rich? What if I got famous? That's not at all why I do it, but what if it happened?. What then? Would I still care as much about the world?

I've always wondered about people like Bono, Bob Geldof, Paul McCartney, etc. They preach about saving the world, with money and with otherwise, and I've always wondered how much they give? How much should (if there is a should) they be giving? Did they always care? Or did it happen once they got bored with their riches and fortune?