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My only problem with tipping is that it's based on percentage, not amount served/work done. Why should you have to tip more because the prices were higher? It doesn't take any more work for the server if the bill is $300 instead of $30.

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Of course it does! Not always. We can be talking about a 30 dollar bottle of wine and a 300 dollar bottle of win. But usually a higher bill means that the server did more work.