Not a valid point imo.
Girls play 3 setters coz that's their maximum. Guys are stronger and they can play 5 setters.
Both genders have players doing singles and doubles at the same time.
You can't give different prizes to the Olympic gold medalist male at 100m and less to the Olympic gold medalist female at 100m.
Yes, she is slower, but it took her the same amount of work and sacrifice to be the best in her gender. She attracts as many spectators as th m, so why less money for the ladies?
That's a bad analogy as both athletes run 100. Currently men play best of 5, while women play best of 3. They are not putting in the same effort.
To use your analogy, would girls deserve same prize money if instead of 100m, they ran 80?