Good find.

Also note that danielodio put some of his startup's money on the card ($100, $49, $300 mentioned in HN comments, and a total of $85 mentioned on twitter). So he almost paid for Sam's withdrawals.

EDIT: I find myself wondering if, in a few hours, Sam and Daniel will give this as a further explanation, and reveal that they'd actually donated the full amount to the card that was taken out. The whole thing is a social experiment; it may not be over.