1) Sam commented in the previous thread about buying food for homeless people from the card [2]
2) Sam's brother Daniel was one of the first to mention the possibility of the card being hacked [3]. His startup also funneled close to $600 into the card [4].
The whole thing started as a social experiment. Sam clearly considers what he's doing a part of the social experiment. I think it's still ongoing -- I fully expect another post, possibly later today or tomorrow morning, detailing the different reactions to his "I bought $25 of food for the homeless" comment and his "I bought $675 worth of food for starving kids in Africa" comment. Couple that with "me and my brother actually paid in what we took out" and we've got the makings of quite the experiment!
[0] http://news.ycombinator.com/item?id=2878622 [1] http://news.ycombinator.com/item?id=2878196 [2] http://news.ycombinator.com/item?id=2857712 [3] http://news.ycombinator.com/item?id=2858120 [4] http://news.ycombinator.com/threads?id=danielodio -- $100, $49, $300, and mentions of a total of $85 on twitter