I hate paper money.  Not American greenbacks, but rather the pink-backs, white-backs, blue-backs or whatever color money it is that comes with a particular game.  Inevitably, it gets bent, torn or mutilated.  Maybe all of the above.  Then, you are playing a great game with one of the major components in nasty shape.  I am talking about the aesthetics of playing a game.  Casual gaming with friends and family ought to be a great experience, not just competition.  Having nice components is like having great glassware — always using the same paper money for a great game is like always drinking wine from the red Solo cup.