XKCD makes in interesting point, my mistake.

Today's XKCD makes the point that of a number of crazy phenomenon, only the proven ones are used by capitalistic businesses. The claim being that the rest aren't real. Well I can agree with him on all but one; prayer. But then again, it's the only one he mentions that can't be monetized even if it's scientifically proven to work. (Then again even I think your crazy if you choose to forgo normal medicine in favor of only prayer, so he's not totally without a point.)