Rez tweeted this: http://www.twitter.com/_rez_/status/278415233675042816
That number is the equivalent of 12 times 12 times 12. Which is 1728.
With a quick google I found out that in 1728, the royal bank of Scotland was the first bank ever to offer overdrafts (withdrawing more money than you have in the bank).
If we found a way to somehow get a negative number in the bank, maybe the card reader would accept that person's navcard. I think the NAV part stands for Net Asset Value. I don't know much about this stuff, but it relates to banking.
Crazy theory, but it's something. Now, is there any way to withdraw or use more money/points than what you have in your bank?