Here, in Romania, the minimum salary on economy is about 300$ and tipping isn't necessary, though lots of people do tip. Honestly, probably many often earn more than me with the tips. I don't get tips where I work, do I don't see why I should tip much. I certainly don't calculate the tips by %. And i don't see why someone who has a job that doesn't require going to college, learning a lot or that involves a high responsibility should earn more than someone who falls into one or more of these categories just because it's an old custom to tip.