I bought few of those "100 trillion dollar" banknotes since I find them cool and perhaps a bit to show off (I made an "in case of emergency break glass" type of thing to be hung on the wall). Those banknotes are unique - unless some other country gets even higher inflation, those will always be shown in every "economy 101" book, so they arent just a thing only for banknote collectors (whom I am not), but also a novelty item for general public (or at least economy students). It seems only the highest denominated bills skyrocketed in price, other bills are relatively cheap.

Supposedly there is a guy who bought a whole briefcase of those 100 trillion banknotes and makes a living by selling them on ebay.