The answer is easy.
There was a article I read in my newspaper half a year ago. It was an editorial, not a scientific study. But it came across honest and true to me, based on what I know. The guy argued, using various cherry picked evidences, that people who're most wealthy don't normally get that way by luck or good fortune. Instead they get that way because of ambition. These people will work hard with or without lots of money. He argued people who're rich by luck will lose it or not build on it.
Damn I wish I had made a favorite for it on my computer. So it was saying a trully successful person will not be ruined by riches and fame because they're by their nature driven to work hard and thereby attain distinction.
EDIT: I googled something similar:
http://elitedaily.com/money/entrepreneurship/ambition-important-success/
How do we find out who's truly ambitious and who isn't? I think one possible way is to ask a question, like this one: "Do you work to live or live to work?" The most successful people live to work. It's in their blood. They work hard rain or shine, poor or rich, sad or happy, disabled or not, male or female. They get back up if they fall. They never quit, never settle!