It takes 6 million steel to kill 1 PD that costs nothing.
No, that is what I use, its not what it takes. darklatiz took one of Oldy's planets with something in the order of 200 ships, split between battleships, cruisers and destroyers. Unless you have actually tried to challenge PD since it was changed and scout defence destroyed, you really have no idea of its effectiveness.
Then again you have another point to consider. What are you going to do with all the resources your planets generate if not expand. Massive Arc fleets are only entertaining for so long after all.
