What is the problem? If you are in protectors enclave .. there should not be an issue with some trade spam .. Sure it could be abused but there are ways to limit how often someone can post in zone chat .. or if X player exceeds X posts a second. This is a small complaint and somewhat irrelevant in my opinion. Major cities…
How about making this available for crafters to make.. IE Tailor makes cloth bags, LW makes leather bags .. Smiths make trunks or chests .. whatever the case may be.
All that is needed .. as stated above is an option the leader can make is only appropriate class can roll. This is in many other games and works great. Get into an organized group or people you know this isnt a problem anyways. F2P player base is generally all ******nozzles anyway