I agree with cherrybim and Dr. Pepper. The teenager is getting three meals a day in a structured environment. He (or she is being supervised by the head staff (those are the ones who actually get paid).
Having spoken to people who run camps, it emerges that not all camps make money, and those that do, the owners are not becoming wealthy from it. Even if the owners were becoming wealthy from it, as long as they do not mistreat their staff (which I haven’t heard), they still have a right to use market forces and pay according to the law of supply and demand.