can i make any money selling e-books?

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I'd really like to try and make some cash by building a website to sell e-books. I have written loads myself and have a quite a large collection with resell rights. Does anyone know how much they usually sell for? Subjects books are on cover psychology, nlp, hypnosis, body language, the human mind, music industry, parascience, parapsychology, guitar playing, using the internet, pc repair and servicing, etc.