set something up so u can close your own topic if u are done with it

what i mean say u are selling an item and u sold it u can close your listing to cut down on spam or what not to let other topics make there way up to the top of the list

been suggested, wont happen

pm someone if you really feel the need to have a topic closed
otherwise just let it die

No, can be easily abused, just don't reply in the topic anymore or if its being spammed report the posts. If its a consistent problem PM the thread to someone to lock it