You know what really grinds my gears?: The moaning thread.

[Esquilax]

From my point of view, to expect a tip is being a dick.
See how malleable a dick is?

You sit at a table with your family. Your server comes up with a smile takes your drink orders laughs at a stupid joke made by your annoying kid. You can't decide what to get, your server pretends to care with a friendly smile and helps you make a ridiculously elaborate order. Your server brings this order to the kitchen and fights a war with the kitchen staff to get your food right while being told off for bringing such a confusing order. He or she carries out food for your entire family on a huge heavy tray. Handling hot plates and making sure you are satisfied with what you have. After you take your sweet time you finally leave and your server has to clean up behind you. After all of this you choose not to tip your server knowing that he or she has earned $6 if lucky for all the work they've done to ensure you had a nice meal with your family. You think you're proving some kind of point about the tips system but you're not because the only person who even knows what you've done is the person who just worked their ass off for you for six dollars and has to go home eating yesterday's left over ramen noodles and call their parents and beg for money to pay their light bill. You've proven nothing, you've changed nothing. It's just being a dick.

Where I come from, nobody tips at all. They don't have to, as the hospitality industry has a protected minimum wage that's sufficient to live on. It's a much more civilized system than expecting servers to jockey for the charity of strangers. You still can tip, but when you do so it's more in line with the whole point of the system, to express gratitude for good service, rather than an expectation in order to keep your servers alive. I was actually surprised when I ordered pizza my first day in America and the website made a point to remind me that I need to tip.