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When taking out an ad at various sites, I can tell you that crime/mystery/thriller is always the most expensive ad (if your book is in that category). I think romance comes in about the same or second? I'd have to check because I haven't done any romance ads. Sci/fi and fantasy are often some of the cheapest ads in genre (non-fiction if they take those ads is usually the cheapest). Mystery is more expensive by quite a lot on some ad sites (Bookbub I'm looking at you.)
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