Why not move the buy/sell topic once done to an 'archive' area. People can still read that area but no posting allowed. Archiving will be work but it'll make the general buy/sell area clean and neat.
When a topic is done ie all items sold...the member must inform buy/sell mods. Then at that point it will be transfered into the archive.
This might be more work than allowing a member to edit posts to add 'completed' 'sold' but will make a buy/sell forum clean with new items only. Of course this is a big suggested change...if that idea isn't liked someone @ sometime has to put in 'sold' in the topic title!
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