Hey DX Wombat, don't be offended. What Glamgirl said is a generalisation.
Thank god, there are still a bunch of people who do behave correctly, who sometimes even put a sincere smile on your face, and make this job somewhat rewarding. If you're one of those people, a big thank you.
But it still does not change the fact that people do have a tendency of demanding more that they've paid for. In my humble opinion the worst ones are the ones that did not pay for the ticket out of their own pocket (so called business people).