I guess that you need to go back into the history of the site. The forums, as they are today, were started in 1999, this was the main site. Then Terry introduced Quizzyland (as it was then called) where people could create and take quizzes. This took off and soon became the main site. Shortly after the quizzes Terry introduced the Chat Rooms which were intended for chatting about the quizzes, the forums were for everyting else. Soon people kept using the Chat Rooms to talk about thing other than actual quizzes and the moderators there were fighting a losing battle in trying to keep it purely about quizzes.
We cannot force people to use the Chat Rooms for what they were intended, and the forums for the rest of it, I would think that the majority of members don't even know that the forums exist.
What would be great is if more people would actually start threads, a fresh thread for each topic, not just adding onto an existing thread.
Forums like the photography and Chains do well.
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Many a child has been spoiled because you can't spank a Grandma!