Vacuum Cleaners Discussions

I note that the American Medical Association published results of a health study finding. In short, it reports that patients who used placebo drugs that cost more stated that their pain was lessened and their relief increased. Patients who used the same drugs but told the cost was less reported the opposite. Not effective for pain relief. Indicating that the more people thought the drugs cost, the more they thought they worked. Contrast this with the Japanese buying mentality. They believe the more the product costs the better it is. Americans are not much different it seems. Could this mentality affect vacuum buyer use and satisfaction? Especially with a certain high price bagless?