Every so often I forget that the average forum reader has very little expertise. They are capable and competent people, but they aren't subject matter experts. When I post a question on a forum, I'm usually asking something that the average person can't answer. I'm looking for information from a SME. There are a few SMEs on forums. A very few. Often, they are so tired of always answering questions that they don't bother any more.
I asked a question on a forum recently. The answers I got ignored the icon I use, which is a D300, and gave me some simple photography tips. And I do mean simple. I responded via PM. And I only PM when I'm pissed.