Because have lots of money gives you the economic power to survive adversity, pursue interests that are more fulfilling, do more good in the world, etc...

I think what TheOtherHobbes means is you can survive adversity and pursue fulfilling interests without rising to the level of 'rich' - unless your interest is something like having colleges name buildings after you!

Indeed, it would be a poor reflection on our society if you had to be in the top percentile for income to merely be economically secure.

Do more of your version of good ;)

Lots of rich well intentioned people doing harmful good. A tangent, I know.