The classified thread has had 36 posts in the last 30 days so that makes it about one post per day. It has some activity but I wouldn’t consider it so significant. I’m sure if it were better organized it would have more posts though. I think some of the debate is whether DW as a whole is better off with a focus on buying and selling.Nursemaids??? That tells me that you don't have much confidence in the membership. We already have a buy/sell thread but it's a PITA because you have to enter at the last post and scroll backwards to have any kind relevance to the present.
If you open the General Discussion page the two threads with the most posts are the Classified thread and the What's your latest purchase thread and it's not even close with the others. My suggestion is just to improve on something that we already have.
As far as reducing admin maintenance of old posts, would you accept an auto deletion of posts after a set time limit?