I have put $50 into the game, and deciding how much longer will play.  In my opinion, the game would be more effective and reasonable if invader and ghosts of different levels were mixed throughout the map.   In the kingdom and clan i am in, their is low activity, and if i also have to spend 5 to 10 minutes round trip per attack to hit these, i will get old fast, especially if a closer town delivers the final strike.