I suspect some of it will be profit, some of it will be engineering. I wouldn't be surprised if the cost of engineering from 16gb to 32gb is roughly similar to

I suspect some of it will be profit, some of it will be engineering. I wouldn't be surprised if the cost of engineering from 16gb to 32gb is roughly similar to the cost of going from 64gb to 128gb. The components could be cheaper, the actual hardware for 64gb might be more versatile than the hardware for 16gb and so on.