In 6 home basketball games, Iowa is averaging 10,307 fans.
https://hawkeyesports.com/sports/mens-basketball/stats
In the two home wrestling duals, the attendance has been the following:
UTC- 10,466
Wisconsin- 10,603
I'd suggest that you get tickets and check out a wrestling dual, but it's most likely that it'll be sold out, so that is pointless.
And really, it's not fair to compare basketball attendance to wrestling attendance b/c 5,000 wrestling fans make more noise than 10,000 basketball fans.
But seriously, come out to a dual and then post here about how the arena is "too comfortable" and "not built for noise".
They even have a term for it in the wrestling world where an Iowa guy who has no business winning a match does it; the opposing wrestler got “Carvered”