Not sure if this has been suggested yet, but I think it would be cool if you added pirate hideouts or guild hideouts. Purchase them for gold and materials and then add like furniture and decorative loot! Maybe also add like a bank or closet. Then have like guild contests for pvp or svs. Also make selling items a bit quicker. Maybe make it so you can right click the item and it automatically sells when you are talking with a tradesman.