Here is the NCAA document showing the men's basketball attendance for all NCAA schools for last season (2021-22 season)-
http://fs.ncaa.org/Docs/stats/m_basketball_RB/2023/Attend.pdf
From page 2-
Average home attendance in Division I- 4,204 per game, in Division II- 427 per game, and Division III- 249 per game
The MVC ranked 10th in average attendance with a league-wide average of 3,280 per game. That was right behind the A-10, and ahead of conferences like CUSA, the MAC, and the Colonial Athletic Association.
Notice the enormous difference between the D1 conferences, and the D2 and D3 conferences in average attendance. The top D1 conferences averaged 10,000-12,000+ per game, while the top D2 conference averaged only 1,035 per game, and the top D3 conference averaged only 606 per game.
Individual team attendance also differs tremendously between D1, D2, and D3. The top D1 teams averaged 18,000-20,000+, while the top D2 team averaged just 2,357, and there are only 3 teams that averaged over 1,433. The top D3 team averaged 1,735, and there were only 4 teams that averaged over 1,000.
Page 14 also shows some interesting numbers. It lists the seasons with the highest average attendance figures for all divisions, and for all divisions combined. The top 10 average attendance seasons were all between 1979 and 1990. For Division I, the top 10 average attendance figures were all between 1989 and 2008.
And on page 17, they show the average attendance figures for all divisions and for D1 by year. The average has dropped every year but one since 2007!
So the dropping attendance is a national problem for all divisions in the NCAA, and for almost all schools. And it's been happening for the last 15 years in Division I, and for the last 30 years in the lower divisions. The peak attendance figures were seen back in the late 1970's through the 1990's.
The major D1 conferences, especially the Big Ten, have not been affected as much as the others. But, it is affecting nearly every mid-major school with a few rare exceptions.
But the solution does not appear to be to drop down to Division II or Division III, where attendance is far smaller than in D1, and the dropoffs are far more substantial.