I have always paid cash for cars and will never own a C63 but I am still offended by this nonsense. The cost of owning a car is what you pay at the beginning, less what you get back at the end, plus the cost of financing the cash outlay. A sensible buyer will try to make this cost the lowest possible based on his planned term of ownership and sources of finance available to him, End of.
Solely using this theory; why would anyone even buy a Merc. They ARE expensive, when compared to most other cars. In truth, it's not all about driving down the cost but obtaining best value for the product in question.
My sister's VW Fox (@ about £6K brand new) is looking like a pretty safe bet under these rules.