So... if you think hard, you might be able to remember some news last summer about an expansion that the Big 10 undertook. Long story short, they added an additional team, the University of Nebraska - Lincoln. Part of the reasoning behind their move (and one of the only strict REQUIREMENTS of the Big 10) was Nebraska's membership in the AAU.
The AAU - American Association of Universities is a consortium of 63 schools known as high level research institutions. Among its members are all of the Big 10, Missouri and the University of Nebraska.
That is, until today. University of Nebraska fails to meet AAU standards, has membership removed. This measure was passed by 2/3 of the AAU's other 62 members. Perlman noted that "most" of the rest of the Big 10 and all of the Big 12 AAU institutions voted against removing the Nebraska from the AAU. So, since KSU, OU, OSU, Baylor and Tx Tech are not AAU Members, that makes 17 current or future conference mates out of the 21 votes needed to keep Nebraska in the AAU, and they STILL didn't get the support needed.
Again, a reminder: Nebraska's Membership in the AAU was seen as one of the more important qualifications to their being invited to join the Big 10.
In what is probably my favorite quote by Harvey Perlman about this issue, he bemoans Nebraska's position as a Land Grant institution as one of the causes of their loss of AAU Status:
"Because of our strong commitment as a land-grant institution to serving the State of Nebraska, we are seriously disadvantaged within the AAU ranking system," he said.
It should be noted that the University of Missouri is a Land Grant institution, and is NOT in danger of losing their status as an AAU Member.