Because then the only restaurants that would exist would be giant corporate chains.
Also, nobody is "entitled" to a wage. The employer decides how much he wants to pay for a given task and you can either accept his terms or not. People don't just "deserve" better pay because they need it.
As for the topic itself, I tip based on the service received. If I spend ~$10 the server is probably getting $1 unless they actually do something they didn't have to. Yesterday at lunch the restaurant I sometimes go to was pretty busy, so I asked the server if she thought I should go somewhere else. She put my order in before the party of like 10 even though they had already ordered before I had even got there. This time my tip was pretty close to $3 for a sandwich that cost me only $9.





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