How the hell do people in the USA afford to drink at bars?

I seriously have contemplated this from the day I started bartending to the present day. But seriously, a beer in a lot of major cities is about $10 right now, a cocktail upwards towards $20. I have a decent income, and no mortgage, I have to sit there and wonder when I watch these people drink what the hell does everyone else do for a living? Does anyone else think this when they go out?
How the hell do people in the USA afford to drink at bars?
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