What merlyn said + it can eat away at your self-esteem if you do excellent work for a client and see it thrown away in the surreal but not entirely uncommon idiom brian_d_foy describes. Being paid to do nothing, or even being paid to do a bad job in spite of offering good work instead, is not good for one's psychology. These kinds of clients should be avoided if you can't massage them, as it were, out of that tack.
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