I realize you are all talking about fiction books, but the return policy is actually very useful when it comes to deciding to purchase math and science textbooks. Sometimes the preview only includes the preface and introduction, which have few or no equations in them. Then, after you purchase the book, you find that they have OCR'ed the equations and they're awful, making the book unusable (at least for the purpose of learning the material). That's certainly a valid reason to return it. (And, if you send an email to Kindle support, they'll usually pull the ebook also.)
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