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I'd say because most people that have a problem, go to the doctor, get a treatment, and are satisfied with the results do not come to a forum where most people are looking for answers or are unsatisfied with the results.

Internet forums are not statistically representative of the population at large, they are a high-affinity population, so the results are always skewed towards the topic of the forum.

That's the reason the gold standard of research is the double blind randomized controlled trials, to avoid the subjectivity and bias that are the basis of the internet