He is utilised to a far greater degree than Martina is
Hours worked
Importance of the matches analysed and co-commented on
Difficult to calculate 'pay' when trading on personality. This is where the gig economy, rather than 'employment', is useful.
You can't compare McEnroe to Navratilova, even they are doing, essentially, the same work.
“Other clubs never came into my thoughts once I knew Arsenal wanted to sign me.”