I wouldn't waste the time stocking them. Profit margin is low. The kids are not going to pay an inflated price for Gatorade, Amp, Monster, etc. Plus, how would you know if they carried it in from outside or purchased it from your concession stand? Imagine the noise from the smartass that is crushing the cans in the auditorium.
I ordered as case of 24 cans of AMP from our Pepsi distributor, for my own personal "stash", as I love the stuff. I paid 20 cents less per can thru Pepsi,than if I would have purchased it from Pick N Save (grocery stores). I thought that I would have saved a lot of $$$$ ordering it direct, but, no way Jose.