> What do you think the profit margin of canned goods is?

For whom? The manufacture? It's closer to 10-30% for the manufacture (lower for white label goods, higher for "premium" brands). And it's higher for products that enjoy monopoly status.

For retailers, it's 2-3%, but retailers also get products on loan and negotiate various agreements that help cover the costs of displays, shipping, marketing, and wastage. So even that small percentage margin is skewed a bit.

There's a reason that retailers and food manufactures ("canned goods") were some of the largest American companies prior to technology taking off. It's a highly profitable industry.