Absolutely . You can see the same bag in the same color go for more than $350 difference in price on ebay depending on the leather characteristics and color saturation. Because the color matters you're still not buying the cream at that great price.
I snapped up a cream Day for $550 never thought they would accept my bid, its brand new and the leather is amazing ( i have a secert amount of B bags most of which are 04/05s and this Ivory Leather is amazing, snapped it up for the summer!
Well, what you said precisely explained why the price diff. exists...not many people want the cream color because it's so hard to keep clean...and it's also not an "exciting" color (although it is beautiful, in my opinion).