I think there is a slight confusion on the colors people buy vs. the colors manufacturers/dealers make available. Example I was on the lot looking at A3s. Black, white, white, blue, beige. Then came back a week later. Blue, white, red, beige. Then a week later. Blue, red, beige. The colors that sell are the colors the dealers make available. The colors that don;t sell are sitting inventory. High risk for dealers to hold. So as a result less are available and thus less are sold.
I ended up buying the Beige A3 because the color grew on me, but on my first visit I hated it. Everyone else must have been buying the black and white cars. So though the color choice was there no one was picking it up.
So I am just saying as manufacturers make colors available, people need to get out of their comfort zone and buy some wacky colors.