Not necessarily
Sometimes I make an e-book purchase to make an existing well-loved p-book easier to carry, or just as a "back-up" (I live in a hurricane-susceptible region, and evacuating with a hard drive is a lot easier than going with boxes of books).
Or, if an e-book impresses me enough, I'm very likely to buy a physical copy, either for myself or as a gift for a friend/relative.
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