Well if posters choose to post a certain way, that is up to them, and I would say that their credibility is determined by what the outcome is with any particular stock. What has happened with JBI makes every negative poster there ever was into a valuable sage for every investor that considers a penny stock again. Their credibility should be without question. If you cannot see that, I cannot help you at all.
Your argument is self-determinant (??.) . If someone does not post their motivation, they have no credibility? I don't think so. How? It is a very basic concept. I don't have to post my motivation, except that almost every post I have made has been dead on good advice. TBG's, for that matter. I don't care what you think about my posting, TBG's posting, or my not posting my motivation.