People don't buy cars in color anymore. Even colors are just slightly off the black to white mostly gray spectrum that makes up today's automotive spectrum. This is the modern BMW play: Aim for the middle and call it exciting. Don't dare be exciting.
A few years ago, I was looking out a window overlooking the Capital Beltway. It was a sunny day and there was hardly a car, SUV, or pickup that went by that was colorful. Black, white, gray, and silver made up an overwhleming majority. shades of muted blues, red, beige, and other meek and inoffensive colors made up almost all of the rest. Being generous, maybe every 10 seconds or so, a car would pass by that could be called bright or deeply saturated [red, blue, yellow, etc]. That's across eight lanes of traffic with a car passing every two seconds in each lane. Half of them were probably red, half of the remainder blue, and the rest something "other."
Most of my life, I've preferred driving cars that blend in colorwise and it's been annoying me more and more. I tried to buy a yellowish car when I bought the FoST, but it was taking too long and my second choice blue became available. I had slim left over pickings when I bought the turbo. I'm really happy I got the 1LE in orange.
I don't know.
Why would BMW go to the trouble and expense of designing, building, certifying, marketing, and supporting a model, but intentionally limit its appeal to drive customers to another model?
The one thing I can think of is a limited capacity to build it and the idea is to not create more demand than they can satisfy.
If it were 30+ years ago, a homologation special might make sense.