If a book bootlegged and sold, that is lost sales, because that is money that is going to the bootlegger instead of to the author. But a downloaded book doesn't equal a lost sale, you can't assume that the person who downloaded the book would have purchased it, or even that that they read it. Sure, some people would have purchased the book if they couldn't download it, but the actual impact on sales is very hard to calculate. You can't simply multiply the number of downloads times the sale price.
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