Upload & Sell: On
Perhaps you've forgotten the wild days when everyone and anyone could bump a thread, often to help out a friend who posted a listing.
If someone other than the OP submits a reply, like "great price" or "good luck on the sale" or anything else gratuitous, the thread gets bumped in less than 12 hours. The 12 hour window only applies to the OP. So the new policy hasn't prevented "social bumping."