The problem the way I see it is that if the formatting (font sizes, margins, etc...) between 2 books is different, then one book might appear to be "thicker" than the other when in fact it wouldn't be the case.
Another way... even if iBooks says that a book contains 300 pages, and another contains 600, the second book is not necessarily longer than the first because its font may be much larger.
I have an other idea though...
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