"If a stock has promoters they aren't going to be hanging out at the private board. People who post on a private board are mostly made up of ones who believe in the company they are invested in and won't be selling anytime soon. Where is a promoter going to get fresh blood on a private board? They will be on the public board where they can pump it to new blood."
The promoters will catch their marks at the public boards and direct them to the private boards "to avoid the noise". That way they can work them over without people piping up with the pesky facts.
Once
The best way to convince a fool that he is wrong is to let him have his own way.