Its part of the new training stuff in the last version. You have to click something on the clipboard to enable yourself as a "trainer". A newbie come on line and sees a list of people willing to help out. After he signs up with a paying account, if he selects you as the person that helps him out, then you get a $10 credit.
The details may be a little off, but that is how I have heard that it works. Being a CM, I dont have the little button on my clipboard though, so I really dont know exactly how it works.