Quote Originally Posted by Kraco View Post
They could have a huge stockpile of those cards, made by various members, many not anymore living on the island. Heck, they could have even bought some from outsiders. Nen seems to remain in objects for a very long time, so nothing would prevent that, to keep the game running despite people leaving.
The whole idea that only a certain number of cards can be in play at any one time, and that the number refreshes once the card is used suggests otherwise though.