Since the subject has turned to tipping in general, I'll add my sincere two cents.
Yeah, I too have spent a lot of time rendering services that generally command tips. Specifically, delivering Domino's pizza.
I never expected to be treated like a king delivering some of the world's crappiest pizza... but I think it's fair to say that one should at least give a dollar plus the leftover change. If the total was $18.42, And I received a $20, I was reasonably happy.
Unfortunately, working in an urban area, a solid 20% of my customers were deplorable cheapasses, and did not tip. That always made me very angry. Apparently they seem to think gasoline and car maintenance are free. I hate to bring it up, but it's true: work in a tipping industry like I did, and you'll quickly learn that minorities are terrible tippers.
I have the statistical proof to back it up. Because of the trend I was noticing, I once decided to track the tips on 100 consecutive non-college-student deliveries. College students were eliminated from the study because we were located next door to the college, and ALL of them tip horribly.
Minorities were out-tipped by a factor of nearly 3-to-1.
I guess I had too much time on my hands at that point in my life.
Edited by WalkTheCourse - 3/31/13 at 11:49pm