I think that there should be a town trading system/industry for large transactions between multiple towns, using the town balance/void storage for these transactions. This would promote towns making big trades with each other, and would help immensely with big trades for modding materials. It would have a similar design to the market, however, it would be between towns instead of players themselves. It would also promote towns trading with each other, rather than individual people throwing items around and gathering resources on their own.