Well, the results show such things can make a big difference, but only in the listeners head; people will swear they hear an improvement with a fancy cable because they do, it is their imagination, but they hear it nonetheless.
Yep. Perception really isn't always your friend. The problem I find with this is that some people are opposed to DBT, based on the argument that by running a 'test' you are subjecting the listener to stress, which will alter how they hear.
I can accept this as a possible issue, but then we can't just say "Just listen to it", as there appears to be plenty of science showing that this isn't reliable.
Makes me recall a test I once heard of, where a bunch of guys listened to some audio equipment, with the tester changing the cables for ever more exotic products. Unsurprisingly, the sound improved with each change. At the end of the experiment, the tester showed the group that he hadn't ever changed the cables on the equipment that was being used!
Perhaps the supposedly-$2.50 sugar pills work better than "real" pain medicine that actually costs $1/pill. If so, just tell people that the pills are more expensive (but that some group is subsidizing the cost) to get more profound results.
There is some research into this. With some medicines (or treatments) the real thing can sometimes have serious side effects, so a placebo can be better.
I saw an interesting program on this subject, and they sighted a trial done on people with serious knee injuries. I believe the treatment was generally some surgery + extensive physio. The surgery was very invasive, and it would take a patient a long time to heal.
On some of the patients, they took them into theatre, sent them to sleep, opened the knee (just the skin) then sewed them right back up - i.e. very simple, nothing invasive, no real work done. The patient of course would have no idea they hadn't really been operated on.
I recall they found that the people who'd had the 'placebo' surgery recovered better, as they still did the same physio work, believed they had been 'fixed' internally, but of course their bodies weren't having to heal from invasive surgery.