Wasn't the term "travel hacker" crafted by a certain website that charges people an exorbitant amount of money for regurgitated FlyerTalk content?
But anyways, just like computer hackers there are varying levels....each wearing different colored "hats".
http://en.wikipedia.org/wiki/Hacker_...cker_attitudes
White hat - credit card churning/mileage runners
Gray hat - US Mint/Amazon Payments/etc
Black hat - ??? yet to hear about anyone going to jail for FF exploits
Script kiddies - mistake fare newbies (who scream for blood when their ticket is cancelled)