Now that the "For Sale " sections are starting to get used quite a bit, I've made it so the owner of the post can delete it if the stuff is sold.
This has the following benefits:
1) I don't have to do it
2) It won't clutter up that section with stuff that's already sold.
3) You won't get annoyed by people who want stuff that you've already sold
You can also go back and delete old posts for stuff that's sold as long as you're the owner.
Cheers,
KC