This sounds like trouble at several levels. Someone's going to reverse engineer your heuristic and min-max it. At that point, you'll need to defend your heuri

This sounds like trouble at several levels. Someone's going to reverse engineer your heuristic and min-max it. At that point, you'll need to defend your heuristic against edge cases. And then you may as well just make it official. Also, B2B customers are allergic to "pay what you feel"-type schemes.