[ojame]

I'm not too familiar with the history of a few that you've mentioned, but the Mustang (excluding the GTD), Supra, Carolla, S2000, Z never had track focused cars. For the time-poor and money-rich racing enthusiast, lacking a turn key package isn't really an option.

Your local track days where you see the likes that you mentioned - you'll also likely get a few Porches etc too. But there's absolutely a culture of racing higher end cars, the GT3's, Ferraris (488 Pista, 360 Challenge Stradale, starting to see XX's around too), the Valkyrie and Valiant etc. There's also those that grab older Cup cars and track them to the track. There's absolutely a market for turn key, track focused, road legal Ferrari's.