Which schools are upset about UConn's attendance numbers?
I hate to sound like one of those idiot conference realignment "insiders" but I do have friends and people I've come upon throughout my years following the sport who work in the athletic departments of multiple HE schools, not just BU. I've been told through the grapevine, and actually not from my friends at BU, that they believed UConn inflated their home attendance numbers at many home games in the first year in an effort to ensure they'd lead the conference in attendance. The line of thinking on the other school's part was this wasn't necessary as the league was so happy with how UConn's attendance was doing in their first year just based on the eye test that even if they hadn't placed first they far exceeded the expectations of the league. Whether these beliefs about inflated numbers are true or to what extent, that's not material, UConn has had excellent attendance. But to answer your question, that's what others in the league had perceived based on their own experiences at XL as well as pictures from games and other reports. Again, really not the most important thing in the world and nothing to lose sleep over.
It's also worth noting that UConn is not the only school that's been mentioned on this topic. Lowell has repeatedly found ways to magically shove 7,000+ people into an arena that sat 6,500 BEFORE they removed a bunch of seats for renovations. I've actually been told by those with direct knowledge that Lowell has purposefully oversold high profile games hoping people with tickets wouldn't show up so they could increase their attendance number for that game. BU being one of those times it occurred, I can tell you with absolute certainty there were nowhere near 7K people in that arena.