why apple launched only 128gb and 256gb in jet black alone ??
I think this is for 2 reasons.
1) They want to promote the new colours as 'Exclusive' by making them more expensive, thus eliminating certainly people and giving it those who are willing to pay the extra.
2) i think the JET Black colour is a little more expensive to make. So instead of charging more for the device, they rather cut the profit on the storage.