Well, it seems interesting that when David Bowie asked the same question to one of MTV's veejays, his answer was more about the sensibilities of the viewers than the lack of supply:

“We have to try and do what we think not only New York and Los Angeles will appreciate, but also Poughkeepsie or the Midwest. Pick some town in the Midwest which would be scared to death by … a string of other black faces, or black music.”

Which is more like saying, "we're not racists, we just have to appease racists to make our profits".

https://www.washingtonpost.com/news/arts-and-entertainment/w...