Don't know if this would even fall into one of your categories, but BOTOX is a rage, to the point where women AND men are having BOTOX parties. Since it is so expensive, and in "simple" treatment cases, some BOTOX remains unused. By having several people scheduled, it cuts the cost.
Most people jump on bandwagons when it comes to their health-even more so when it involves cosmetics. All of the dangers are not well publicized and people don't have enough info before they sign up.
The same problem exists for elective procedures and a lack of KNOWLEDGEABLE practitioners who go to a weekend course and "learn" the recipe without understanding the ingredients.
http://www.google.com/search?hl=en&i...=Google+Search
edited to add this link.