Earlier quoted context omitted.
Who cares about delaying an entire plane of busy people when you can save $20? [/bitter]
The article has an example of saving $189 (about 50% of the published price of the ticket in question), and a post in this thread had an example of saving 500 euro on a transatlantic flight. So it's not always trivial amount of money.
Come to think of it, this question is about as close to an objective measure of an individual's level of morality as we can get. Screw all theories of moral relativism; I can tell whether you're a good person or not by knowing how much money it would take to tempt you to leave an entire planeload of people sitting on the tarmac for an extra ten minutes.