I think what Stephen may have been referring to is that this section is intended to be used for the personal, not commercial sale of equipment. If you make your living purchasing and selling/trading instruments for a profit your listing is most appropriate for the "Seen on eBay, Craigslist, or elsewhere" section of the site. If you are selling your gear on a personal level for whatever reason, you have a right to post here. Sometimes when people are posting multiple pieces of equipment, it is difficult to discern the difference.