I've come up with the suggestion of having flea market which are alongside the current static traders.This would create a player influenced economy. Allowing players more opportunities and expand the pre-existing content. Thus, allowing players to shape the future of the servers economy and give more more options when purchasing goods which are currently not available. This option would be easily managed and balanced being that certain rules could be implemented to have a limit on goods sold / bought of a certain quantity. Furthermore, this could be expanded to having it also available on the website to check if certain items in the player auction are available to purchase. These items would be taken from the seller and stored then returned upon purchase. Ultimately allowing those hoarders on the server, to get rid of their goods in a sensible manner whilst letting others which purchase them gain their needed items to further progress.
"One man's trash is another man's treasure" - Yotam Ottolenghi