It can take a bundle of cash to run an expensive car hard. The craziest example I've heard yet is that Porsche had to start recommending that their GT3's optional centerlock wheel bearings need to be replaced after each event.In retrospect, someone driving a Nissan GT-R or Dodge Demon, they likely have no problem spending the necessities to keep the car peforming optimally if they are tracking regularly or for competition purposes.
You can run cheaper cars, too, or even rent a car for a race series (I know of shops that manage some Spec Miata cars for rent). Nobody needs a $100,000 car to have fun on a track.
Yessir. Don't go as fast (rules governing course design dictate that cars can't go faster than highway speed), but the corner elements come at you super-quick, and the worst that happens (usually) is that you slide wide and knock some cones over.Auto x is autocross?