Interest comment on one of the linked articles:
Quote:
I'll be curious to see if Overdrive/Kindle ebooks will have a message that pops up right before it is about to expire that says, "Your ebook is about to expire - click here to purchase a copy." Talk about direct-marketing to your target audience.
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Amazon aren't stupid

Even cleverer would be: "Your library doesn't have a copy of the next book in this series, but you can buy it from us by clicking here."