If the match happens, neither one, vis-a-vis their respective combat sport, is appealing. Both mayweather and professional boxing have greater longevity. (mayweather has 20 years 49-0 vs mcgregor 9 years 21-3; Proboxing has been around since early 1900’s vs UFC early 1990’s.) Perhaps a 50-0 milestone would have some meaning.
Get real, 50-50 is delusion. The winner gets the lions’ share.