What if "loot chests" spawned rarely that could only be unlocked after walking a certain amount of Km/miles? They could also be Available at the shop for only a few unobtaioum or as low as 99¢. It would provide s cheap way to maybe get unobtaioum and it would encourage folks walking and not just claiming land and leveling if up... This is just a loose idea so some critique would be awesome