Coming to know of the true health of Alexander's bank account was certainly a blow for the two regal ladies, especially as they had handled some finances in their time.
So they were able to have some sort of reference to compare the sum with, thus making them appreciate the enormous nature of the quote even more.
It was almost mind boggling.
Now, they of course knew Alexander was very rich- that was hardly the shocker.
One just needed to take a single look at the literal fleets of ships docking at his port every single day or how the roads would sometimes get jammed up with various cargo carts despite how enormously wide they were or how Alexander had constructed three new huge city gates all solely for the movement of his cargo to come to that 'difficult' conclusion.
It was not hard to tell business was booming.