Well that study linked by Pengwuino basically wiped out our entire "medicine" department. Fortunately I transferred departments, so I don't really have to sell that garbage anymore. I was usually pretty blunt about what I've read and told customers that it's basically just water, but they still end up buying it and thanking me. I guess I'm just a really good saleswoman. =D
I also think this is worth mentioning, just for amusement.
I don't think it's truly homeopathic, but the description uses the word anyway. I found these while just walking around on shift one day. I'm not really sure what they are supposed to do, but I recall reading that they contain 30% alcohol or something like that. And oddly, these are huge sellers as well. It is definitely a profitable business.