Are Salvage Grocery Stores Extreme?

Is it extremely frugal to shop at salvage grocery stores? I got into a conversation with someone who thought so. She thought the food there was out of date, crunched cans and ripped packages. I tried to tell her that the government didn't allow food like that to be sold for human consumption.

So... do you shop at salvage grocery stores? I do. And I don't think it's extreme, but I think it's smart.