You killed farming with last upgrade
Whether planned or not you have ruined the game for active players who liked to farm other people to get resources. I'm not sure why but it needs fixing or you will lose lots of players plus its harder now for people to upgrade so new players won't bother either. Why not actually think about upgrades before you implement them?
Change back the way it was or lose players and money, I and others no longer buying gems as their is no need to boost barracks as there's no loot to get.