game is. A money game is where the big names are looking for a sure win and pay smaller schools to play the games. The bigger schools would schedule their own games with no to little TV considerations. The biggest reason the smaller schools do this is because one money game would pay for half of their schools budget for the year.
Ask USU about money games, they were playing them at the beginning of each year and it wasn't because they bigger schools thought it would be a hard fought game, they thought it would be an easy victory for them and USU needed the money for their program.
BYU's situation is much different, they are not having P5 schools seeking them out for an easy win, ESPN has their hands in most of these games because it is a money maker for all involved, the P5 school, because there will be a good number of BYU fans that show up, they will also get TV money because it will usually be a nationally televised game, BYU makes money, not because it's getting paid from the P5 school, but getting paid because of their TV contract with ESPN, and then ESPN makes money because they know that BYU puts a decent amount on eyeballs on such a match up, so these games for BYU are nothing even close to a "money" game.
The closest thing BYU has had in a money game was with ND, not that they got paid because they played the game, but they got paid because they didn't play in Provo.