I remember when the rich lists had Paul McCartney's wealth at £800m but when he had to open his books up to forensic accountants for his divorce case in 2008 it was found he only had about £400m.
Yup, because like everyone else, Sir Paul spends money.
In the year before his divorce Macca spent around £4.25m on general living costs including professional fees.
Mick Jagger has an extensive private collection of Andy Warhol's art. How are the wealth guessers going to put a value on that?
It’s ridiculous for anyone to believe you can derive individual net worth from band touring revenue.
The list is an attempt to estimate such things, not prove them.
When you know gross sales, the other stuff can be estimated.
Economist and statisticians make these estimates about individuals, groups of people, lower class, middle class, upper class, in every country around the world daily.
There are list estimating the net worth of every country in the world.