Who defines good content? Obviously blatant link stuffing on non-related topics is spam. Obviously on-topic paragraphs of text on-topic without links is not s

Who defines good content? Obviously blatant link stuffing on non-related topics is spam. Obviously on-topic paragraphs of text on-topic without links is not spam. What about on-topic posts with a link back to my affiliate sales on on-topic products? What about on-topic posts with 5 links back to my affiliate sales page? (check out my favorite 5 workout videos on a post about womens health). How substantial does the content need to be? "I really enjoyed this post, and I think that you are right on about XYZ. I read this book <amazon affiliate url>". Basically, the problem with web spam is that the obvious stuff slaps you in your face as obvious. The gray area is really wide in some cases. Also, the whole post was predicated on the fact that people have an obligation to provide you value when you put up a web form. That seems pretty presumptuous. I decided to send an HTTP POST with my content. You decided to post it up to the world.