If you look at the teams that fill their stadiums, you usually find...
they aren't the top tier academic schools. AU, Bama, Clemson, FSU, etc have rabid fans but aren't exactly academic stalwarts. On the other hand; tech, Vandy, Stanford, etc are well know for academics, but their stadiums aren't exactly packed.
Those 2 MNC games really help the AU admin ask for, and get, more too.