One reason you may want to care about this "fake money" is the buy, borrow, die tax avoidance scheme you can run if you're asset rich [1]
[1] https://old.reddit.com/r/BuyBorrowDieExplained/comments/1f26...
[1] https://old.reddit.com/r/BuyBorrowDieExplained/comments/1f26...
[1] https://www.sciencedirect.com/science/article/abs/pii/S00472...