.. and that's the reason why I think there should be a well-functioning and regulated market for these kinds of things. Magnets, homeopathic remedies, chiropractors, etc.

As long as there is regulation preventing manufacturers and practicioners from claiming they can cure cancer/etc., and the remedies do not have any harmful side effects, why on earth should we leave a treatment as powerful as placebo off the table?

GP here has significantly reduced his painkiller intake and reduced chronic pain by putting some magnets on his feet. That is without doubt a strong net positive outcome. Why do we mock it?