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I've seen CFAR talk about this before, and I don't view it as strong evidence that CFAR is valuable.
For these ratings to be meaningful, I'd like to see something like a control workshop where CFAR asks people to pay $3900 and then teaches them a bunch of techniques that are known to be useless but still sound cool, and then ask them to rate their experience. Obviously this is both unethical and impractical, so I don't suggest actually doing this. Perhaps "derpy self-improvement" workshops can serve as a control?