Few people say it like xkcd says it. If you don’t know xkcd, you must check it out: http://xkcd.com/808/
Onward to the point:
I think that poster is spot on (as usual). If any of those woo related things worked, big business would be making money from it. Everything that helps make money, is used to help make money. If simple common sense isn’t good enough to convince you, surely simple capitalism is?