This is how much UFC fighter Ronda Rousey made fighting Bethe Correa | Fortune
When you start comparing the highest level UFC fighter's pay to that of the lowest athletes from other sports, you'd understand why fighters like Ngannou and Jones want to be paid more. :
UFC Fighter Salary And Bonuses Per Fight: How Much Do They Earn?
In U.F.C., Retirement Threats Are the Fighters' New Leverage - The New York Times
How much do UFC fighters make? - AS USA
UFC Fighter Pay: What's Wrong with It and How to Solve It | News, Scores, Highlights, Stats, and Rumors | Bleacher Report