only the ones who have tried it should have a say on whether it works or not
I really don't get this argument...
So to to take a completely imaginary scenario: Someone has a product and is unable to provide any evidence that it works, they can make any claim they want about how great it is and put a big price tag on it. If they were really cynical they could create an account on this forum and pretend to be a customer that's 'seen the light'. And then everyone else gets told to buy one before they can have an opinion on whether it stands a chance of working... like I said, a completely imaginary scenario.