that is exactly what it can be.
charge 50 usd per sponsor to put their logo on the cards, half goes on cards for the first say 100 people at the festival so that they can have a spending experience, and the rest goes to be split between the festival organizer and the ppl bringing the cards. they cards are open source, so anyone can do this without asking out permissions at any time they like. its a ready made business model for any hivean to make money off right now.