>>The Kennedys are a perfect example that nothing of value can be bought with money.<<
How about selective inbreeding? The rich and powerful only marry the rich and powerful. They beget children, who marry each other.
What one might call unnatural selection? Whatever we choose to call it, people like Caroline seem to regard the decisions they make as a natural outcome of a royal prerogative coming to them simply by virtue of their mere existence, and requiring no further thought on their part.