Actually, there are a few cases in which you should tip in Japan. For example, in Japanese style hotels called "Ryokan", though only at very expensive ones, you are supposed to give the servants called "Nakai" good amount of tips, (it ranges from 20 or 30 dollars value to a few hundred dollars value, depends on how the person feels and how rich he/she is.) nicely wrapped in an envelope, on which you have to write some formal Japanese word which means tip. (I don't remember what the word is.) Well, of course they don't get pissed or anything if you don't tip, but that's the high-class manner. I personally haven't tipped anyone in Japan because I don't hang out in those high class places, but I'm sure someday, at least once in my life, I will have to do so. I doubt that many young people know about this custom though, so people might stop doing this eventually, for the practicality sake.

Time like this, I get reminded that not every information on the web is correct.