If your guess is true that would put WVU fans at about 36% of Total Capacity. Which is enough to seriously negate the "home crowd" during negative momentum swings, and thats all I give a shit about. I will add when pitt comes to WVU, no way in hell they even hit 20% of our Capacity. We all know pitt fans dont show up to games, while this year you may have some Fairweather fans, attendance tracking data is easily found online and pitt is near the bottom in terms of P5(Ranks in the low 50s from year to year). However WVU ranks in the low 30's(31).. Out of 65 P5 programs.
"Despite having their best season in 40 years, Pitt football home games averaged an attendance of only 45,365 (66% capacity) in 2021. WVU had a losing season, a smaller stadium, and still averaged 51,617 attendance at home"
WVU 5 Year Average = 56484 (Data Collected in 2020) RANK 31st
pitt 5 Year Average = 43117 (Data Collected in 2020) RANK 52nd
Either way you slice it, home field advantage supposed to be an advantage, but with approx 35%-40% of all asses in seats being opponent fans, that seriously negates the effects of home field and how a crowd can impact the game. Thats why Home field in sports betting is usually worth about 2.5 - 3 points. So there is some value there, and in a close game, it could be an indirect source of the difference.