I think you guys may be a bit over harsh on this. He's obviously not in this as a business and even with those numbers, you're looking at a cost of under $400 to do it with $680 coming in. For a first time gig.. for a church group that he looks like he belongs to, it's not a horrible deal.
Someone just trying to get their feet wet and at the same time trying to do someone a favor doesn't need to make 200% profit right out of the gate.
We've done similar deals for folks when we were first getting started. My real concern would be the ability for someone just starting out being able to safely cook for and serve that many people.
4000 sq inch Wood Burner named Brutus - KCSB member/judge# 32129