Does the placebo affect work both ways? Actually yes, apparently it does, it's called a nocebo affect. Something to ponder perhaps.
Anyway it's all moot because the poster we're debating admits that mains conditioners can have an affect if the power supply in a component is imperfect, admits that not all components have perfect power supplies, and still argues that mains conditioners can have no affect. It's a genuine shame because he has much to give that is genuinely worthwhile. He chooses instead consistently to argue the same old point on what everybody else on this forum tries to tell him is rather dodgy ground. Many of us don't actually disagree with him on very much at all apart from his rigid adherence to a debating policy premised not upon actual evidence but rather upon aggression and the belittlement of the direct actual experience of his opponents. He isn't ever going to be prepared actually to put the theory he espouses to experimental test. So his theory will always remain just that, a theory, and will never become fact.
In short, he is, most assuredly, a bit of a plonker.