Instructors may need work but they sure don't want to lose money on it. $200 to the instructor huh? An appropriate crewpack itself costs around $77. That leaves $123 for the instructor to cover pool rental, tank fills, fuel, DMs and four ocean dives. Good deal. Is there any left to cover overhead like equipment, insurance, a boat, etc.? After that, is there any left for the instructor's time? It sounds to me like you and PADI are the only people making anything with that deal. I must admiot, however, that your oil spill reference was pretty slick.
Again, my apologies to the OP as well as to the moderator who will have to clean up this thread.