There are way more than even that count of 1/12 mfgs. You can't "water down" a market with cars... People will buy what they want regardless of number of mfgs. You can water it down with more and more classes though. More mfgs in a single class doesn't do much to change the number of people running in a given class, if anything it brings more people in who want to try something different.

It is nice to have options, unlike TC where you are stuck with what ever 3 or 4 dominant mfgs insist you should buy.

I think we should be encouraging more development, and mfgs to throw their hat in. It makes the class more fun.