The inside greeting can be added by the buyer. It would be better if the artist could design the cards with a verse inside but allow the buyer to edit the inside. I sell cards on another site and almost all cards sold have a verse on the inside, very few cards that are blank on the inside sell. I am still a low volume seller on that site, currently selling on average 11 cards per day but that number is growing very quickly and expect that to reach 20-25 per day within a year. That will not and cannot happen on FAA because of the limitations in design options.
http://www.greetingcarduniverse.com/Michael_Peychich
