Forum:Why Close Discussions?

Why are forum threads closed, or as stated, "archived", in the Yu-Gi-Oh! wiki after a certain amount of time that no one has added to the discussion? In other wikis, the forums and discussion boards are left open; for example, in the Avatar wiki of the forum "Sokka's True Love--Suki or Yue", http://avatar.wikia.com/wiki/Thread:1228084, one of the last posts for quite a while had been in September 2014, and then someone else added to the discussion board on September 2015, literally almost a full year later, and people started again all the way to this month, June 2016, posting their thoughts. Why is it not allowed to post in forums in this wiki much later, leaving them open (not including ones that have been stopped because of extremely rude language and such) for anyone able to add to the discussions if others come up with ideas to help the creator and others posting with any possible questions or topics in these forum threads? Why is there a time limit?Mistystar31 (talk • contribs) 04:11, June 23, 2016 (UTC)