Because that’s also not desirable all the time either. There are lots of one make series out there but they can be pretty mixed in how fun they are to watch. I was at Croft a few weeks ago and the BTCC rounds were incredible, close racing with overtakes and near miss crashes.

The Porsche GT and GT Sprint Cups (911 and Cayman respectively) were a lot more like a procession where the faster drivers quickly ordered themselves and drove away from the rest of the grid. Granted there were fewer cars starting, which didn’t help, but it still didn’t make for exciting viewing.