I personally preferred screen size comparisons, such as when reading LRF's on my 505, but outside of my reader, with my font sizes, that has no frame of reference.
I just personally take a look at the size of the printed book. Like I said before, and ekster also said, I just don't want to buy a book only to find it is drastically shorter than the norm. Say if the average book costs $10, and I can read it for 8 hours, I'm paying roughly, $1.25 per hour for book. Compare that to the aforementioned Encyclopedia Brown books. The one newer one costs $10.99 (I guess went down a dollar after they released a couple other ones), and so, that'd be roughly $43.96 per hour at the rate I read those books. That's an extreme case, but still happens. Even if it just takes me 4 hours to read the book, I'd be consuming the books at a rate double what I am used to, and would greatly effect how much I spend. I'd have to buy another book much sooner. If it is a minor difference in size, I'm not so worried, its just the big differences.
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