You didn't, and that's your oversight.Please, I've read my post again. When did I even mention high school students? Performance would be contractually tied to performance on the field at the college that booster who's paying for the "NIL" deal supports.
For example, a kid negotiates a "NIL" deal with a booster for Nebraska. The contract WITH THE BOOSTER (disguised as NIL) would state that the player has to meet certain performance metrics to be paid (i.e. become a starter or actual player at some point to be negotiated, win some awards, etc.) They could also get some incentives for example if they meet certain metrics and the team wins a certain number of games (both would have to be met).
Or, they could just negotiate anything they want that's legal to lure the kid to the school.
What's stopping kids in highschool from signing NIL deals?