I am not sure of this is done already, if so please point me in the right direction. There are quite a few player group (non guild, clan, official organization) trade companies advertising themselves. Some are virtual and some use a base of operations such as a house or the Arms. I think that these trade companies should some how have to be officially sanctioned and have to follow some code of pricing and conduct (not that haggling, discounts, and trades should be forbidden). Also to make sure that all goods (and CNR) were appropriated within the server rules and that some guarantee of quality (no swords that have been smashed into CNR veins 9 times before being put up for sale) is assured. Starting a player group trade company is a big thing and far different from a lone crafter who sometimes makes an item for order or who make something special and posts it for sale. If there was some certification process that these trade groups had to go through then perhaps they could be a clearing house for the lone crafter and could put some of the player crafters that don't want to bother with running a business on retainer for items. This could be a good way to help balance the economy. I know that some trade groups are “sanctioned” as a guild/clan/organization but I don't think all trade companies are.
Cheers