this doesnt really include the following:
assembly costs
shipping costs
research and development costs
licensing fees (to use certain patents etc)
marketing
etc..
There is still a huge margin but not as much as state here.
Still blows my mind they didnt put in 2 gb of ram when it would only be a few $ more but think about it $5 x 10million devices. Plus when they upgrade it next year they can use it as a selling point.
It takes more power to operate more RAM. And yes, they could have done that and increased the size of the battery more.