TCU and Baylor both usually outdraw Washington State and Oregon State at the gate. K-State, ISU, and WVU usually beat them by 10K+ at the gate. WSU is lucky to break 30K for a home game. Every school in the new Big 12 has a better local recruiting footprint than the Beavers and Cougars.
TV is the thing that matters, though, and it's hard to compare for a lot of reasons. A lot of the PAC inventory has been unrated on the PACN for the last decade. Almost every bad Big 12 game has been aired somewhere (FS1, ESPNU, etc.) The new AAC adds have been playing games on ESPNU, at weird times, on weird days, against private schools. The weakness of the AAC makes it easier for UH, Cincy, and UCF to string together really good seasons occasionally (and the AP ranking boots the TV numbers when that happens.) But that league has been an albatross around the necks of those schools, too. The longer term upside leans *heavily* in favor of the Big 12's AAC adds against WSU/OrSt.
Another thumb on the scale for the Big 12 is basketball. WSU and Oregon State have essentially zero value in the other revenue sport. UH and UC both have legitimate value there. UCF is capable of it, too, given the local basketball recruiting turf in Orlando.