I am guessing that they ran out of the first batch of Gift Cards, and had to order some more. Don't forget, most of the prizes were won in the first days of the contest (much to their surprise, I am sure). When HET realized this, they had to have _something_ to give away.... so they added more GC's, as well as more of the Entertainment and Dining board prizes. For a while there, everybody who played that day won Entertainment and Dining. Now, it has tapered off again.
They are promising the gift cards, but they don't have them in their hands yet.
Just a theory.
- bcc