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'm lucky in that I have a real grocery store nearby to compare to. If you live in a food desert where these big chains have driven out all competition you wouldn't have a choice.
Let's play with Tide, and with Kroger and Dollar General just because those are the two retailers that are near to me. We'll do biggest and smallest, and start with the smallest.
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The smallest bottle of original Tide that the Dollar General near me has is 34 ounces for $6.00: $0.1765 per ounce.
The Kroger near me has a similar, but lesser, bottle as their smallest offering: 32 ounce bottles for $5.99: $0.1872 per ounce.
Dollar General wins on smallest.
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The biggest bottle of Tide at Dollar General is 115 ounces; regularly, $16.95 ($0.147 per ounce). On sale for $15.95 ($0.139 per ounce). With a $4-off digital coupon, $11.95 ($0.104 per ounce).
At Kroger: 132 ounces for $19.99 ($0.151 per ounce). (With a $5-off-of-$25 digital coupon if I feel like giving Proctor & Gamble even more of my money in one transaction.)
Dollar General also wins at biggest. They win at regular price, and today they also win at sale price.
shrug
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Convenience also has a cost. For instance: I ran out of cat food on Christmas Day. Everything nearby was closed except for a Circle K, so I walked over there to see what they had. And they had cat food (of course they did). I bought the smallest container of Purina dry cat food I've ever seen for ~$9.
That was a lot of money for such a small amount of cat food, but I was happy to pay it. They had the right product in the right place at the right time. (And most importantly, the cat was happy.)