Unless it was a big publisher or sponsor, people wouldn't really trust a prize draw like that to be fair.
When David Moody had a new book out earlier this year he had a competition where you had to send in a photo of yourself holding the book within its first week of release for a chance to win a T-shirt. I don't think he got many takers, but the idea would have been to get as many people as possible buying the book within a short period of time. If you can hit a best seller list, even if just for a short period of time, that will be its own promotion.
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