You might be surprised to learn that a lot of the world uses polymer banknotes which are siignificantly more durable and last a lot longer than traditional 'paper' based currencies. The are incredibly hard to tear/break and they do not wear out or stretch. We've been using these in Australia since 1996.
Having handled a fair amount of US currency I can say it _feels_ disgusting to handle after a certain amount of wear and often reminds me of a moist tissue. It also doesn't help that visually the notes all look very similar (as opposed to on polymer notes which have significantly different appearances and colours)
https://en.wikipedia.org/wiki/Polymer_banknote
Having handled a fair amount of US currency I can say it _feels_ disgusting to handle after a certain amount of wear and often reminds me of a moist tissue. It also doesn't help that visually the notes all look very similar (as opposed to on polymer notes which have significantly different appearances and colours)