Don't let the pumpers get you down. You could say the sky is blue, but as long as their company PR's the sky is red, they will never admit otherwise.
It really isn't the pumper clowns you are trying to convince of the facts. It is all the lurkers that just read looking for information. Academic studies have shown that for every poster on an internet board, there are 20-30 people who just read. It is really for those people that presenting the facts about a company are so important. And many of them do listen, even if they don't post or don't tell you so. I don't get that many PM's thanking me for presenting factual information about these companies, but the ones I do get are almost always from someone who never, or nearly never, posts anything. They are out there, and the facts do make a difference.