So, we want to reward the best students. In the past, prior to when I got there, they used to receive the Principal's List every month, and give out coupons. I don't know exactly why they stopped that, but I don't think it'd be a bad idea to restart that.
The problem with the GPA idea is that I don't know exactly how much information that schools can disclose. Without getting too into specifics, I'm sure they could provide us a list of students with 3.0+ GPAs, but I'd have to send out a few emails to find out if that's possible. Another problem with the appetizer idea is that we hardly generate any profit from them, because the markup is, relatively speaking, very low.
So while we want the future business, we will probably approach this as a small treat for current business. I'm thinking 20% off to the monthly Principal's List, or, like Laurah said, cater something like a pizza party for the top students.