Why do the colors of average quality cars doesn't seem to be diverse enough?

Brands like Toyota, Honda, Nissan, Ford, Acura, Kia, Dodge, etc. Tend to sell their cars with boring and opaque colors like gray, black, dark red and pretty much colors with no vividness. Don't you guys think they would sell more cars if they came up with more interesting colors like purple, yellow, green and other colors that could be more appealing to the eye?

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