Supercars aren't allowed to be dirty. Heck, they aren't allowed to be smudged. 

Fingerprints must be immediately buffed out. And let's not even talk about that which birds will sometime do in the vicinity of cars. You're best off keeping your supercar inside when it rains.

The implicit requirement that you maintain your supercar in showroom-new condition, if not art-gallery-level nick, is oppressive. These are not machines that you can run through the gas-station car wash. No, they demand detailing. Every single time they're cleaned. 

And not just any detailing, but, rather, supercar-grade detailing. So if you're accustomed to that twice-yearly detailing bill of $200, well, get ready for Special Forces-caliber detailing — and the massive hit to your bank account.