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Not every eBook is around 1MB in size. I can easily generate normal eBooks in PDF format which are 10MB or more, especially if I include illustrations. That's only 200 eBooks in a 2GB card.
Besides, there are other things one may want to store in a card, not just eBooks. There's pictures and images, there's music and audiobooks, there's source files and master copies of eBooks generated by oneself. And why stop there? Why could't someone expect to carry backups, special software, etc in a single card when traveling?
That said, I don't particularly need a card larger than 2GB now, but I can see some use in that.
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