My first thought was of the old 'snake oil' salesman ( from the linked site):
Uses for Oregano Oil
* excellent germicide capable of killing various fungi
* useful against bacterial infections and parasites.
* combating diarrhea and intestinal gas
* digestive problems
* migraine headaches
* candida
* eczema
* athletes foot
* sore throat, breathing problems
* immediate relief from bee stings, venomous bites
* fighting dandruff, diaper rash and other skin disorders

I'm surprised they didn't include something about it curing cancer and HIV/AIDS.
Sorry if this upsets anyone, I really do believe in holistic health, but that laundry list of uses was just too much for me.