I find the nonexistence (or nearly so) of money in stark contrast to the principle characters favorite pasttimepastime -poker poker. Its hard to imagine poker being the same game if the chips are just meaningless markers.
The psychology of pocker requires that one have significant "skin in the game". If itsit's just some meaningless chips that will be lost, rather than a months pay if your bluff is called, it is a lot easier to feinfeign confidence. Sure, they have a theoretical understanding of money, but that isn't the same thing as the understanding of money of someone who struggles to pay the rent.