The iPad probably moves a lot more units though due to more general appeal. There are economies of scale that e-ink devices don't currently benefit from. Also

The iPad probably moves a lot more units though due to more general appeal. There are economies of scale that e-ink devices don't currently benefit from. Also if you try buy an e-ink screen as a part for a project you'll see a difference in price, which will no doubt be a factor too (though the difference you or I pay for a single unit might not be entire indicative of what is paid for bulk/regular orders by manufacturers).