I think your numbers are wrong there. Just doing a quick order of magnitude calculation, with 4 million pictures on an 8 GB card you get about 2 KB per picture. That's somewhere around stamp sized... My photos are about 1-2 MB per picture on a 4 megapixel camera.
My books tend to be around 0.5-1 MB. On my readers' card (256 MB) I have about 180 books, some of them about 20 MB (lecture scripts, don't ask).
However, I totally fail to see how the number of books on your reader connects to the number of books you can have in your Calibre library.
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