Economic sense is complicated
Economic sense is complicated...the fastest/coolest car buys a lot of street cred. Every NASCAR participant and Ferrari and Mclaren are trying to buy the same...the NASCAR boys have a everyman product (as does Tesla) but the others are mainly just bolstering the sales to a couple thousand uber-rich. Both P100Ds and M3s are riding on the roadster's shirt tails..and the name recognition doesn't hurt SpaceX, solar or Tesla walls either.