Because their hopes and dreams were not dashed in their previous game. Why is this so hard to understand?
2018 teams eligible to not play motivated:
Michigan
Georgia
2017
Auburn - L
Wisconsin - W
2016
Michigan - L
2015
Iowa - L
2014
N/A
2013
Missouri - W
Ohio State - L
These teams were going to be in the NCCG or CFP, but lost their last game of the season, rendering their big goals moot. Only two of them won in such a case. This isn't some convoluted BS, based on Bama losing to Utah in 2008, it's a real, live thing. It doesn't guarantee a loss in their bowl game, but it does guarantee these 21 year old kids have less to play for than they did the game before, and often times, this affects their play. Period.