You're talking about a $60k+ (realistically probably more like $80k) vehicle. Aluminum body panels for luxury cars in that class have long been similarly priced. If you bought an all aluminum Audi A8 in 1999 for a similar price, you'd be in a similar situation. If you balk at that kind of repair bill, you shouldn't be considering a car in that price range.

Your comparison of the used Ferrari hood is hardly applicable at all. First it's a used part, second it's a carbon fiber part, not aluminum.

Additionally, why would you expect to pay the price for the part yourself? That's what insurance is for. In reality, Tesla is doing you a favor by making their body panels so expensive because that means it's easier for your car to get declared a total write off in an accident and you can get a new car instead of a busted up repaired car that will never be the same (as anyone who's had a car repaired from a major accident can tell you.)

Lastly, I'd imagine the cost of Tesla body parts has a lot to do with the fact that they are in extremely high demand right now because there's still a waiting list. Any body panel Tesla sells you can't be used to build a car.