> you can have a single die that cuts XVIIIII, and use it iv times
To be a bit more explicit, you use the the die four (4) times, and get 4 Xs, 4 Vs, and 4*IIIII = 20 Is, which is exactly right for I II III IIII V VI VII VIII IX X XI XII. Using IV would mean a 5 Vs, but only 4 Xs, and 17 Is, so you couldn't cut a full set with a single die without using a much larger die (= more work making and using the die) or having extra pieces (= wasted material) left over.