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Sometimes.
There are some books I will only buy once - in either paper or e-format depending on price and availability. In those cases, each e-book sale represents a lost print sale - and each print sale represents a lost e-sale.
There are other books that I have bought in both paper and e-formats - sometimes more than once. However, I will say that I'm more likely to buy an e-book of a paper volume I already own than a paper volume of an e-book I already own. So maybe the e-book does lead to a loss of a future paper sale? But is that really a loss if I've already bought it once?
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