They could, but they won't, because the price varies more than FFXIV. FFXIV has 4 subscription prices, depending on whether you buy 1 or 8 character slots, and whether you are Legacy or not. They only sell a card for the full subscription for non-Legacy pricing. FFXI has a variable fee for every amount of characters you could have $12.95-27.95, so 16 different fees. Since more people play multiple characters, there is no standard they could do to activate an account for everyone. They COULD just do Crysta cards to cover all of their games, like Steam, PSN, and Xbox Live do for their cards...