Lack of Motivation
Most college players know that they won’t make it to the NFL but some are on the brink. If they don’t receive NIL deals like the very best athletes they may lose motivation and this could affect their team’s results. We’ve discussed morale in the locker room, but this is a question of intrinsic value.

Jealousy may arise because the elite players depend on their supporting cast to win games. They can’t do it by themselves but they’ll make the money from it. Meanwhile, the other members of the roster will know this and may not feel motivated to push themselves if there’s no long-term gain (via Sporting News).