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I'd much rather scan my own groceries and pump my own gas instead of waiting for someone else to do it.

I'm much more invested in how long it takes these things to be done than an hourly wage earner.

Do you also want to go to the kitchen and start bringing your own food and drinks? Getting up a few times, going there and asking if it's done. Imagine if you have dozens of people/kids running around getting food, maybe spilling it on the floor in the process, bothering people in the kitchen etc. Are you better at scanning items and handling errors than someone who's been doing it for years? The same applies to waiters, cooks etc.

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