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Isn't the issue the DRM protection that publishers require? (If there's no DRM, then we can already put one book per card pretty cheaply. I think some people have even said that they prefer that tactile benefit for organizing e-books. I suppose it also adds more importance to each book compared to just a file on a CD-ROM or hard drive with many more books.)
But once you enable devices to read it, you enable them to copy it. So if you don't want to allow them to copy from it, then you have to tie it to specific devices and/or reader software. But we can do that without tying it to a physical card.
There must be some advantage, because many people seem to want this, and it keeps coming up. I just don't get it. Why would we gain by tying an e-book to a physical storage card?
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