I'm sure that you really don't know what the circumstances of the departure of CU and Nebraska really were. Although it happened years ago, let me remind you.

1) CU was going to leave for the Pac 10 regardless. CU (and its President and Board of Regents) always wanted to be affiliated with the Pac 10 Universities instead of schools in Kansas and Iowa. When the Big 12 was created, CU never really had any affiliation with the Texas schools (the Big 12 South).

2)Nebraska's problem wasn't that Texas was taking too much revenue, Nebraska was opposed to EQUAL revenue sharing. Nebraska literally said at the time that they wouldn't stay in a conference that split revenues equally. 

3) Nebraska was opposed to a conference championship game. Nebraska was mad that Texas wouldn't allow them to keep recruiting Juco partial academic qualifiers.

4) Nebraska, like CU, got a better offer to join a more stable conference. The Big 10 is undeniably more stable than the Big 12.