Which comes to mind because I know a few people who are quite knowledgeable about medicine, committed to evidence and rigor, and also go to treatments like acupuncture regularly. They all do it with that same sort of winking sense that sure, this probably doesn't work double-blind, but as long as I don't focus too hard on that it'll work for me. One or two have even said that they consciously avoided investigating past "it's not harmful" to preserve ambiguity.
I'd always wondered how well that kind of doublethink could do for placebo, and while this isn't exactly the same I'm excited to find a discussion along those lines.