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Would a novel with vampires sell better than a novel about ninjas?

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I was trying to eyeball the various sales ranks on Amazon for a few different book types and was wondering if a book that featured vampires would sell better than one that did not feature vampires, in general.

Considering twilight (and harry potter, though there aren't vampires, but very close to it, etc, as a deatheater is kind of like a psychic vampire) it seems that books with vampires do sell incredibly well, however, more movies of course have no vampires than movies with them. (eg, the 2nd and 3rd blade movies, I think most people ignored).

What do you think? Vampires + ninjas, or just ninjas? :)