So...we have one data point being referenced here, the SK1/SK2 classes and a recent divisional...
Take a look at entries for the next Tour event offering a street tire index class (2...not percent, two) and normal, r-comp stock classes (30% of entry), Packwood...
Then get back to me
That's why I keep pointing to the National Street Tire Challenge events as a meaningful data point, as they are the only events, with SCCA support/contingency/visibility, we currently have to gauge broad based interest in this idea. Not perfect, but at least a data point that shows how "serious" people are...I'd certainly expect, if there really is grass roots level support, it would be reflected in blow the doors off type attendance. My guess is the only event that draws anything close to a normal Tour is Milwaukee, the region that started the series. It would be nice, in many ways, to be wrong, however...