Anyone can call themselves a photographer and charge people money for photos. That's not the hard part, Craig's List is full of these fauxtographers. I can hand my 12 yr old son a box camera, and he'd do a better job than most of them. Most of those "wedding photographers selling pictures" won't even be around a year from now.
LOL - I would call that an "attitude". I was not speaking of 12 year olds. Here is one wedding photographer that offers meaningful real world tips, using on-camera flash (one speedlight):
http://neilvn.com/tangents/flash-photography-techniques/
Yes, a four light studio setup is a different situation, but fantastically wonderful things (and generally more useful things, much more portable) can be done with one on-camera flash, by anyone that wants to try to find out what its about. Specifically there, see the list of archived articles in the blue box at right (header: Articles, specifically those numbered 1..17). It is really not about weddings at all, it is about photography with on-camera flash (bounce mostly).
Stuff we all need to know, stuff possible for all, all it takes is to try a little. We get much better real fast.