You're forgetting the 3k includes maintenance (fluid, brake pad and tire replacement are of particular note here, if we're comparing it to cost of ownership in the first 3 years) and insurance, both of which can be significant on a sports car.

Although if I were in the position to decide between using this service and purchasing (I can dream, can't I?), I would purchase the vehicle (well actually I would buy a Dodge Demon, still dreaming here).

Maintenance in a new car at Porche level the first few years will not be much, so don't get fooled by it.

That's why I noted consumables, which you will need to replace more often and will be more expensive in a sports car.

yes, but not in a summer, which is how long OP wants to use one.