Traffic e-books

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Has anyone ever bought one of those e-books that show you how to increase traffic to a web site? I have seen many of them, they all have the same information, only thing that changes are sometimes the programs to promote your traffic, with all of these books having affiliate links for you to sign up under the author, who I think is the one who really increases his traffic. Or is there really a book out there that can show you alterantive and easy ways to get traffic?