Yeah, a well-done trailer can definitely increase sales, as long as you can get the word out. I've had lots of people tell me they checked out my blurbs and reviews and then bought the book after seeing one of my trailers.
As long as it doesn't look like a power point presentation. Too many just have fade in and out of words and I really don't like those. The dynamic ones are fun to watch though... that said, I wouldn't spend a lot of money on them.
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