When you really think about it, the whole notion that we shouldn't get free refills is built on the idea that there isn't enough beverage to go around. That if you have free refills, you might drink enough that other people won't get any at all. That's silly. The abundance of beverage is so well known, so evident, and so important that you can find it in the text of holy books. "My cup runneth over," it says. You know what? All of our cups should runneth over.
Our mugs, anyway.