<font color=yellow>Sometimes</font>, I don't think it the author trying to make money out of us, so much as the publisher. When they see they are onto a good thing, they just keep pushing the author to produce more of the same with the argument that 'the public' ONLY want more of the same.
Some authors can do it, and keep the quality pretty good - some can't. For the ones who can't, it would be much more sensible and fulfilling to produce something entirely different. Just my opinion
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