Even if they accurately charged shelf prices, these places are still a ripoff targeting the vulnerable. The list price is low but the per-unit price is astronomical compared to grocery store prices.
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I lived in a city that’s in North Metro Atlanta (Johns Creek) where the median household income was $160K. There was a Dollar General right by a Publix. People still went in the Dollar General for little things where the small packages that you could buy was feature and not a bug.
We still stop by the dollar store for snacks sometimes because it is convenient just to get things to pack for a flight. It’s especially popular for tourists in Orlando where I live