There is a theory most people dismiss because it sounds like sour grapes, but is mostly true. Most rich people are rich in part because they wanted to get (or stay) rich more badly than others. This is a boring life goal. As a result, most rich people are boring.
Anecdote: the richest people at my library were the most reluctant to pay the smallest of library fines. Once the fine was 15p and the guy pulled out a clip of 20s as fat as my fist to pay it, after much fuss. "That's how rich people stay rich" my friend said.
