The Sunday Times has a great interview with Felix Dennis about what it takes to become rich. I loved his answer when ask just how rich he actually was.

I don’t know. Nor does any rich person know. I haven’t cashed in all my assets and I’m not certain what they will fetch. Let’s say $400m-$900m (£215m- £483m) of net worth before tax.Five homes. Three estates. Fancy cars. Private jets. (The jets are always rented. If it flies, floats or fornicates, always rent it — it’s cheaper in the long run.)