you can't post wanted/trade ads on ebay.. plus you have the rest of the world competing for the same item usually.
the terms on shipping, and all the details would be worked out between the seller/buyer. only buy from people you trust, same for the seller.
you can put out a request list, list of things to trade, or sell. There's no waiting 6-7 days for the "auction" to go off like on ebay.
what type of newsagent are you referring to macca?
As far as your comment slougi, I don't know how many roms each person has; nor do i really care.
I really see no harm in it.. we could set one up, and if things dont go well we can always take it down. I see no reason not to try it.