I don't know if it's just me, but the megathreads are basically providing an excuse for people to be smart asses. Sure, if I wanted to comment on the latest MMA or Flames story, I could post it in the related megathread, but it will more than likely get lost in the 160+ pages in the MMA thread or the 8+ pages in the Flames thread.
I understand if moderators don't want repetitive threads, but I don't see much harm in closing the newer thread in favor of the thread that was started first.