There is constantly one thing I am missing here and by "here" I mean the forum. It's a kind of a thread that works well for many other games: a market thread or rather a forum section for this. Of course there are the auctions, but it would be a great idea to have a forum section where people could put advertisements like "I would offer X gold for Y amount of Z potions" or Q items or something as well as offering a certain amount of resources.
