I'll just put this out there if you want someone to keep control of a buy/sell board I volunteer to do it. I used to moderate the old AOL buy/sell crafting boards way back when lol. It would give us a place to unload our extras and hold swaps etc.
I would love to have that board back too. I bought quite a few things from the buy/sell board and sold maybe 2-3 things, but I never had a problem with any of the Peas. Maybe I was really lucky. I don't think so. I think most Peas were in it for the same reason I was. Get rid of the extra scrap stuff you don't want and hopefully someone else can use it and would like it too. We used Paypal so the payment part was easy and protected.
As long as it doesn't become a huge dumping ground for a business to use (and we did have rules for that) I don' t see why it wouldn't work here. I miss it. It's the first thing I would check, then NSBR, then the scrapping board.