the 70's (or the 60's for that matter)
I can remember them on Bloor Street in Toronto. Hare Kristna with their braided ponytails. They never gave me any flowers. The really annoying ones were the Scientologists, they were rabid.
Actually "The Secret" is not so much about marketing as it is a look into positive thinking. I suppose they have been able to make back their production costs. But they're not really selling anything.