It would prob help cut down on the number B&S forum rules broken, if like when leaving feedback (you check 2 boxes), that you had to check a box or two relating to important rules that seem to get broken ALL the time. Most people I PM with don't even know that there are forum rules. Seems like it would be simple enough to implement as you already have it set up to leave feedback,
5. Please do not delete any information, including images or selling price, at any time, including when you close your thread. Simply choose “close thread”. If you have a multi-item listing, please merely put a highly visible “SOLD” beside the sold item.