Actually a lot of teams are doing this often. For some reason, we are getting more attention.
Look at Georgia's 2022 schedule below for example. They bought out of games with Virginia and East Tennessee State. Even your Auburn Tigers regularly buy-out of games. I am also not sure sure if Tennessee was the only one that wanted out of the BYU matchup. BYU is moving to the Big12 and I imagine that impacted their schedule and may have made the buy-out more attractive to them. The key is that Tennessee should have MOVED it instead of buying it out. The worse infraction by Tennessee, IMO was buying out of North Carolina matchup in 2012 to keep the Oregon game. We should have dumped the Oregon game because we were no match for Oregon and played North Carolina (or at the least rescheduled the games to have both).
Army was another shitty move.