It should be about what the market dictates right? - if not you can make a case for principle of equality, but what does equality mean exactly?
Taken to its logical conclusion, or in other words to have equality implemented in professional tennis, you would pay all players the same amount -that's equality right? . So men and women and all professional players would get the same, but why stop at the ATP WTA? real equality would mean wheelchair tennis players should be played the same, why shouldn't they unless we don't think they're equal, in this none defined, hard to understand sense of equality. And so it goes on, and on. The logic of equality is just that - people are treated the same, even though their abilities, enthusiasms and capacities are clearly not the same. Tennis, like all sports is almost by definition a game that celebrates inequality, i'm as able to play like Djokovic as i am able to fly, will never get anywhere near - i'm too old, with no discernable ability whatsoever, that's just reality.
This may shock the causal reader, and please take a sharp intake of breath before going any further....in some ways, men and women are different.
