Good morning, Deadly,
I certainly agree that there are major differences between the two; however, you cannot necessarily do what you wish with printed books. For example, you cannot copy all of the pages of the book - that's illegal under copyright laws. You are correct, however, in that you can sell your printed works while you cannot sell e-Books. I just responded to another post with a link to an article where publishers are, themselves, looking at removing DRM.
As to arbitrarily taking your e-book off your system, I wouldn't put too much into that "alleged" ability. I know of no instance where this has ever happened.
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