It's an evil system, but it's there to get people to do said content more than they normally would. Now I think there is a way to exploit ones vanity with these cards but I don't think people are going to like it. Foil Cards. Let's say you can only Need the card on a weekly basis and greed the rest of the week. However the cards which drop in this manner now have an RNG chance of being a foil/shiney card when used. You would have a group of people who do said content, fight over the weekly need, and then attempt to greed the rest of the week if they really wanted the "rare version" of the card while not affecting it's purpose in being there. To get people to do the content more than they would.