I would think theres only one real benefit to either.
DRM - You bought a book and you dont want to use it for just, say, the Kindle. So you rip the DRM off and put it on other things such as your Nook, iPhone or whichever other device.
SCAN - The book is on pback or hardcover but not yet an ebook. The person scanning has gotten tired of waiting and wants to read it on an ereader of their choice so they rip it apart and scan it.
Now I could be wrong but thats the only reason I can think of for either.
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