You can die cut any quantity of cards BUT the setup costs make it uneconomical on less than a few thousand. I used to work for a foil printer who did custom die cutting, while I was at college (early 2000s) and even then you were looking at in excess of £50 for a simple die. Plus around an hour setting up the machine (we used a converted Heidelberg Windmill) then the length of time actually stood operating the press as it cut (often as little as 15 mins for a few thousand impressions).