I’ve actually thought about this a few times. I agree with you that there are some cars that are entirely reasonable to expect to be around on public roads. I feel like there should be a liability cap that limits the financial responsibility of someone in extreme cases. Like hey you want to buy a McLaren P1 and drive it around? Knock yourself out. But if someone hits you some of that cost is going to be on you, which you can presumably afford given that your car is the cost of a house.

Of course the point is that this is what insurance is for, but insurance has coverage maximums that may be insufficient in many cases with rare/exotic vehicles. Ignoring that, anyone that hits an overly expensive car is almost certainly getting hit with a massive rate hike, or may find themselves almost struggling to find coverage.