Not sure what the big deal is BYU in 2013 was ranked #28 in home attendance at 61K + per game. Looking at he list of all schools on page 6 I think any school over, 30k is doing okay, 40k is doing good and if your 50k+ then you got great attendance. If your in the top 30 SHUT UP your living the dream!!!!!!!
http://fs.ncaa.org/Docs/stats/football_records/Attendance/2013.pdf
If they want to sell out then do what the NFL does, black out the game in the local market.......Like that would ever happen.