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Well, I probably don't have a good response, but I'ma try to answer xD Please bear in mind that this is just my personal view and is in no way an official guild policy, or anything resembling an official guild policy.

As new threads are posted, they bump the old ones off the end of the forum, so the old threads are basically "recycled".

In the main guild forum, accidentally posting in old threads isn't an issue - if it's on the first page of the forum, then it's probably an okay topic to post in. So, if you wanted to post in old topics, you'd have to go back a few pages to find them.

The subforums are very inactive, though. For this reason, you can have threads that are like six months old but still on the front page.

In the subforums, I know I tend to be a little more lax about necroposting when modding. If it's been only a couple weeks since the last post, or if the response is interesting/entertaining and adds something to the discussion (a new way to look at the topic, or fresh insight), then I usually leave it alone. This isn't an official rule or anything; just my personal modding style.

However, a lot of people post just for the sake of posting (like "I agree" or "I'm not into that"); they add nothing to the discussion. If posts like that are in a fresh thread, they're usually ignored in favor of the active discussion. However, if a thread is necroposted with a post like that, I for one tend to drop the hammer on that.

So basically, if you wanted to respond to an old thread, I would suggest making sure it's in a subforum, and also make sure that your post brings a new idea to the discussion. You might still get a warning, but you'd have a better argument in favor of your post.