I know you can use 6 of each unit per player in a battle. What about buildings like Bunker and Turret? if I have 6 bunkers am I really getting more defense than buying just one if I have no aliance. Or is there no limit to Bunkers, If I am playing as one player and buy 10, will all the defense points be used from all 10? or 20 or 30 or them? Just curious how the game works with the non money making buildings. Should I buy as many as I can or is 6 the most I can use like the other units?