Alex
Top Contributor
If this is related mainly to eBay traffic, then provide a means for genuine and full seller and buyer feedback. ebay changed the feedback system for the worse some time back.
Allow photos to show damaged/incorrect goods etc.
You would have to have some way of authenticating users to ensure they are the genuine buyer or seller.
People do have ability to comment socially on items. If I am understanding the suggestion correctly it sounds like more development than I really want to get into.
If I was to allow people to post items for sale on the site it would function more like gumtree. This is how I would more so like the site to function.