I'm not convinced a price cap is going to level the playing field if people can run what they want. If companies really do start building cars tailored for this kind of class, then people are going to feel the need to replace their ride with the next best thing rather frequently. $350 per ride won't help much if you go through several of them per season.

Also, I saw no mention of motor restrictions. What's stopping a good driver from getting a really cheap car and sticking in a cheap modified motor and blowing through the field? The newbie who sees this car would buy it out, and be unable to drive it and end up breaking it at the next race. That newbie won't be coming back again.