The upper deck end zone is where almost all of the visiting team's allotment of 3000 tickets is. So yeah, of course there were a lot of nitters there.
I think even 70-30 is way over estimating the number of nitters there.
It was only half of the upper end zone with nitters. The rest of that section was overflow students and Pitt fans. I sit on the visitors side in the lower bowl, and it was predominantly Pitt fans in the lower bowl with a smattering of PSU fans. Maybe the upper deck had some PSU fans, I couldn't see it. I'd have to say it was maybe 80/20 Pitt, max 15,000 PSU fans. No more than that. It's about the same as when WVU used to come to Heinz Field. They blow it out their asses about how they'll dominate the place, then they bring maybe 10,000 - 15,000 fans, if that.