I'm sure it will grow. I don't know why they don't advertise this sale in advance. Silly Smashwords.
I found Katie's most recent Immortalis book and added that one to my cart
I'm going through "My Library" and checking all my wishlist books to see if they are on sale.
I wonder if it would be okay to start a thread in the Self-Promotion forum so all the MR authors participating in the Smashwords sale can let us know and post links to their books.