One of several things may have happened:
Because the Daily Cards are designed to have an accessible price, and they are completed almost daily, those twenty cent renewal fees start to add up. If I renew too often, I will not be able to continue offering them.
The best solution is to save renewals for holidays and special occasions. So, if you see a card you like, add it to your (or your friend's) growing art collection before it vanishes.
The best way to find out about renewal events is to join my mailing list.