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Thats pretty much my opinion too. Forum discussions are generally different than most other social networks that are prevalent these days. There is a slower pace, a more thoughtful approach, and a greater emphasis on quality over quantity.
I can understand that there is a portion of new members who are new to this form of communication. They might ask a question, read the answers, but then simply disappear, never to be seen again. It is possible that they find the slower pace frustrating or that they dont fully understand the etiquette of forum discussions. But thats probably only a small percentage. This is just my guess, but I believe that most of the newbies here arent really newbies at all.