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My personal feeling is that they are not worth the trouble. For one thing, even if you decide you love the book, you can't click a link and buy it right away, and I think that is essential for selling e-books. Another thing is that unless you are in the video business or knows someone who is and will work for free, you are likely to end up with something pretty crappy. And the time it takes to make a decent trailer is time spent not writing.
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