It's literally their only advantage. If you only watch sports for the display of talent and athleticism, why would you watch the league where the champions consistently lose to teenage boys?

You're just left with an audience of women for whom their in-group bias makes the male leagues unrelatable, and fan so prolific the male leagues don't provide enough hours so they start watching the female leagues too.

But put on the skimpy outfits and you might at least attract the fans who want a mix of athleticism and eye-candy that the male leagues can't provide.