It also just so happens grey scale is almost always cheaper. Car color historically correlates with prosperity in the US
https://magazine.northeast.aaa.com/daily/life/cars-trucks/au...
https://www.ppg.com/en-US/autocoatings/color/history-of-colo...
https://magazine.northeast.aaa.com/daily/life/cars-trucks/au...
https://www.ppg.com/en-US/autocoatings/color/history-of-colo...
I mean I see the inverse as true, and entry level vehicles seem to have the most colour diversity in their sales. It is cars like the Nissan Versa where you see real colour variations.