Actually, a couple of my ebooks already have "ads", though they're not really the type that everyone fears. I've had a couple Tor-published ebooks that, at the end of the book, include a few chapters from the next book in a series or a list of books by the author that I may also enjoy. Essentially a "suggested reading" list if you liked the book you just finished. If that's not an ad to sell more books, I don't know what is. But it's not intrusive and it's not unlike the typical pbook experience now.
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