I wonder why placebos work so well. I guess placebos don't work if you know they are placebos. That's the rub right there. If people believe that what they are taking is the drug they are told they are taking.
The problem with selling placebos and saying that they are something else is that it is illegal. If you tell someone that what they are taking is an anxiety medication and it is really just a sugar pill, the odds that these people find out is low, but it would certainly be a healthier alternative. But then you can never really trust your doctor or pharmacist, can you?