i think its reasonable that the extra 0.2 armor comes at such an increased cost. its the best of the best and its reasonable to assume that its made by some fancy high grade alloy thats only slightly more effective but much more pricy for those who really want it/need it. so i think the price range between the different armors make sense.
however the price of caus in relation to the ships themselves make no sense. its hard to believe that armor should be more costly to produce than a fully equipped battleship.
perhaps battleships should cost more to reflect this.
