New Radiohead album - Pay what you think is fair??

[Kneel B4 Zod]

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Yes, but the tip is an implied part of the service and is paid based on the expectancy that you will get good service in the future. You are held accountable for not tipping.

There is no accountability here.

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there is accountability, b/c "pay whatever you feel like" is different than "free".

as gus said, sidewalk entertainers wouldn't be there if people didn't throw quarters in occasionally. just b/c you're not obligated to pay doesn't mean it's irrational to do so.