Ali was the biggest star of his generation and one of the biggest stars ever. Ali’s biggest purses would be around the $20-$40M range if he was fighting in 2016-2017 when you take inflation into consideration. Ali however would have earnt this on free to air television. If he was introduced to the PPV structure, Ali would have earnt a lot more money. His character was divisive similar to Mayweather Jr’s, however Ali was a Heavyweight which made him much more marketable. Ali would have been the biggest earner in the history of the sport if he was around today. He would be earning between $50-$100M per fight. He would be close to the richest athlete ever.