I'm not sure about a license, I guess the company has to get some kind of certificate. Is there a cow-physiotherapy/massage-course somewhere? ;-)

I knew allready of the professional mourners for a long time, because we had someone on TV that went to the US to do this to show it exists.

Pick-up artists (see below) don't give the best pick-up-line, they give advice about how to be more confident and happy with yourself. Which in the end is the best thing there is: love yourself first, so you can love others.