> The unwillingness of anyone to run such an experiment is already an answer. Why wouldn't someone jump at an opportunity to prove the thing/service they provid

> The unwillingness of anyone to run such an experiment is already an answer. Why wouldn't someone jump at an opportunity to prove the thing/service they provide actually works, unless they were unsure about it themselves? Or they have run the experiment and the results haven't lines up with their own personal biases so they were discarded.