ok, let me try this a different way since I'm obviously being unclear..
If you have a question, are you more likely to
A) Read through 10 or more pages of a mega thread in the hopes that someone already asked and had it answered to your satisfaction
B ) Use the search function (which we obviously know that people don't use)
or C) post your question at the end of the Mega Thread or in a new Thread, which gets merged and lost, never actually getting closure?
Now, if one of the forum mods was pruning questions into an easy to navigate single FAQ post for each update, they would be actually useful tools that could be easily referred to when a person asks the same question again, closing the redundant thread and reducing overall spam.
You could go 1 step further and have 2 posts in the thread.. one of Answered/closed questions, and one of questions that are as of yet, unanswered.