If it's a simple guide and is common to be done through common sense give it away to a select few people.
If it's a method you're sure no one knows about and is guaranteed to be a good buy, sell it.
Yeah, I got what you meant too. But you can't just slap on words and say meh people will get it...
It's why false advertising laws are enforced, so if you do make a sales thread just choose another way to explain it.