Actually, unless they are self-published, most "new-age self-help" books are pretty thoughtfully edited. They are persuasive writing, whose goal is to convince you to believe in a framework that is not supported by evidence. Dismissing them for being incoherent is actually a mistake, in that it shows a lack of understanding of their appeal.

Though, I must admit, I'm not sure exactly what you meant by "new-age self-help" books, so I took a guess.