Sometimes a manufacturer will discontinue a colour if it performs very badly, or exceptionally well from a sales perspective. It could also be to protect second hand values should it be deemed that a particular colour has saturated the market.
They may also pull a colour that is known to be troublesome in application or if their supplier can’t produce the required volumes.
Finally, it’s one of the easiest differentiators between a current and new model year, requiring less technical and production considerations than say major, or even minimal spec changes.
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