I have not heard of this. There is the soda card but this is the first time I have seen a drink card. At $40 a day and considering a drink can run $7 to $8 each, it wouldn't take but 5 drinks to make that pay off. I don't drink that much every day but I am sure there are people that could (or would if they had already paid that much)
I wonder if it was something special Carnival arranged with their group?
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013