Didn't want to derail the milling party thread, but curious about a hypothetical situation.

Suppose someone has the equipment to finish 80% AR lowers. Could they actually charge for training by showing another how to do it by providing a demonstration, how to operate the equipment. Then allow a person to use the equipment for free. No charge for the machine time, and the lower owner does all the work. Fee would be just for teaching how to run the equipment.