If these care people keep spamming supost, I think that the best way to deal with them is just to ask for test drives of their really nice/expensive cars. It would be fun for you and when nobody is buying them after lots of test drives I think that they'll get the picture.

Seriously though, I think that everyone should reach out and test drive a car. After all, who isn't really interested in a luxury/sports car (even if you can't afford it.