Mayweather's $1.1 billion came almost entirely from two fights: the 2015 Pacquiao bout ($300M+ take-home) and the 2017 McGregor crossover ($275M+ take-home). He negotiated promotional control, took home 50%+ of revenue after expenses, and built Mayweather Promotions as an actual business that generates ongoing revenue. His spending was absurd—private jets, diamond chains, luxury real estate—but the infrastructure kept generating money. Tyson earned his $300M spread across two decades with lower purse structures, higher taxes, and zero equity in the business side. He was paid as a fighter, not a stakeholder.

The real killer for Tyson was structural: his peak earnings came in the 1980s-90s when boxing purses were lower, tax rates were brutal, and he had zero financial literacy. He famously spent $4.5M annually on lifestyle while making sporadic income. Mayweather, despite the reading-level jokes, surrounded himself with actual business managers and accountants who structured his deals. Tyson had Don King—a promoter whose incentives were to extract value, not preserve it. Mayweather also fought fewer times (50 fights across 20+ years) and charged exponentially more per fight, while Tyson fought constantly early on, burning capital and risking injury with each bout.

Tyson's comeback is genuinely impressive but fundamentally different: he's rebuilt through new revenue streams (Hotboxe podcast, Tyson Ranch cannabis brand) that generate passive income rather than fighting again at 57. Mayweather's $400M sits mostly untouched because he already won—he doesn't need to grind. Tyson's $10M is a real recovery from $23M in debt, but it's built on hustle, not legacy wealth protection. One man became wealthy and kept it; the other became wealthy and lost it, then had to rebuild from scratch.