I remember listening to ESPN 700 during PAC12 Media Day leading up to Utah's first year in the PAC12. The commentators were making a big deal about Utah's sell-outs in Rice-Eccles Stadium. Then, they switched gears and started knocking UCLA for having something like 65-70% attendance. I did a bit of quick math, and realized that the guys were being idiots. 65-70% in the Rose Bowl beats 100% RES.
That said, BYU's attendance has been trending down lately. I think they need to do something to rejuvenate the program...