What's to stop a "backyard skydiving" "crowd" from stripping a C206 and cramming 8 skydivers into it?
Parachute ops are not cost sharing flights, the customer pays to drop from a parachute, the plane is a private operation to get them to the drop point at the cost of the skydiving operation. The cost of the plane is considered a cost that comes out of the payment to hang from a chute so the flight is not a hire/reward flight. Which is why jump pilots are paid next to nothing.