You may not consciously buy a book because of the cover, in fact I'd wager this is actually true for the majority of books that are purchased, but that cover does have some affect on you. It may just be as simple as catching your eye, or a neat juxtaposition of images and the text.
I'm not saying books with poorly designed covers aren't purchased, nor that there is a universal 'good' design across all the subjects of books. But within the subjects there are trends. You can see it best with genre fiction, especially if you take the time to go to the sub-genre level.
All that said, the inside of a book can be well crafted with these stylish raised capitals, etc. etc. but when it comes down to it I want to -read- the book. I often find the more stylistic choices that are taken with print books to be annoying. I do wish things like images were handled better but I think that's more a limitation of the ereader than the ebook.
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