My nieces are high school/college aged and volleyball is the only sport they follow.I’ll add this - I bet 60% or more of the volleyball crowds are under the age of 25 - not including students . You certainly can’t say that for Pitt football and basketball. The Louisville match at the Pete had to be like 75% girls 14-22.
It’s interesting- PItt’s official volleyball instagram page has more followers than men’s basketball ( less than PItt football )
And - my daughter knows every volleyball player - and can’t name a single football player .