GA, please explain the logic of ; inviting a successful class to come and race with SCCA and then changing one costly parameter of that class, one that is a large part responsible for that success.
Copy success, dont EFit up.

I see no reason to repeat past mistakes. Keep it simple and cheap.
The R tires have no good rewards other than a little G load. You also slide through the grass faster and hit the wall harder. Please tell me one benefit of R tires other than maybe you get them for free.
It would make the most sense to start this class on the 20 tires that most Chumpemons have in the garage . Once the horse is out of the barn, you cant go back. ( You could loosen the rule up later to meet demand) but once some new guy's wife buys him a set of Hoes. it 's over.
Chumps spend more on fuel than tires!!
There are maybe 12-15 "R tire" classes that are already weak. Allowing R tires to this class would just add to the weakness. The R guys can run someplace else.
Having a dedicated group on streets makes a lot of sense.
180 Tires would indeed allow double dipping for the rest of the IT cars and some of the Prod cars. 400$ per set of tires is like free for most of you. One set of wheels and tires are about the same $ as 4 Hoes and can last 50 sessions.

Chumps went Chump for a few reasons. Hassle, cost, track time.
You comment makes no sense and is rude.
MM