Just ask any CISO if they would bet their job on surviving a $1M unrestricted red team exercise with a year-long timeframe. They would all be scared shitless by the thought. I bet if you asked the CISO of MGM three days before the attack: "How much would it cost to hack MGM and cripple operations?" they would answer like every other CISO I have heard answer that question and say something on the order of $100K. They know it does not work; they are there to be sacrificed and just hope it does not happen on their watch.