1) Whether yearly income is representative of present and/or future net worth is entirely unrelated to whether the magnitude of said income is discoverable.
2) Everyone has a different definition of "fair." Which one are you using?
(1) The original question is ["elsewhere it's like [this], is that better?"]
I merely point out a major caveat.
(2) From the article: "In reality, fairness is not so much about the actual distribution of loot as it is about the psychology of how you feel about it."
Suppose a professional gambler made exactly the same amount as Eric Schmidt per year. This "system" would fine them equally. But the gambler relies on his bankroll as his asset, whereas Schmidt relies on his reputation and personal network.
How can you make this fair?