I can easily answer that. Watching a guy completely blow through his money and act like a fool is something you simply can't put a price on although he's now has 300 million in the bank after that fight plus much more coming from the residuals and sales revenue
Career earnings are around $400M pre-tax. Now, subtract Uncle Sam, Leonard Ellerbe, 88 cars, TMT payroll, his gambling bankroll, leased G5sx2 (he won't let his security fly on the same plane with him b/c of their weight. You might call this Aaliyah Syndrome.), etc, etc, etc.
His career earning will come-in around $500M pre-tax after the next 2 fights.
Based of his ignorance and mouth, he can't get sponsors. Hope I'm not right, but he will be an interesting financial story in 7-10 yrs.
BTW, Buffett's investment strategy pays off when you are fucking 65 yrs or older. Not one of these athletes will follow his advance.