Collectable Erasers are, in fact, a thing. It makes me wonder, is it important to keep them in mint condition, or is it okay for half of it to be rubbed off? Are certain Erasers valued by what it was that they had erased? Like, if a special edition uncommon from series 2 was used to erase half a page of Picaso’s student sketchbook- would it be worth more then a sealed mail-away rare from series 1? Hard to know, quite frankly.