There is a good ammount of solid info to be found in a forum, especially this one I am sure, You have to know where to look though. That being said, only an idiot would use unofficial information to teach with.

I have read some of the site owners pages here. I can tell that he is a well seasoned and well respected individual in the survival community and I would teach using Doug Ritters stuff any day. If people are using that information in classrooms all across the world I would believe it.

The forum however, is just that. A forum.

Personally I think ETS(or any other survival forum) would fold like a pair of two's if they tried making people pay for it.