I've often questioned this charge for colors strategy GM has.
I could see it on the paint colors which require more processing...but it is inconsistent.
Furthermore, at least on the GMC/Chevy vehicles, the same colors are availble with different pricing.
GMC: Summit White is standard price, all others are $495, except the Pearl White, which is $1095
Chevy: All colors are standard price (same color choices as GMC), except Cherry Red Tintcoat for $459 and Pearl White which is $995
Caddi: Black Raven is standard price, others are $695, and Pearl White is $1295
It is purely a marketing strategy, I just find it odd, because it clearly is a zero additional cost thing in MFG, except for the multi-step process colors...
Marketing is funny sometimes.