So you think Costco's master plan is to sell people hot dogs and soda at or below cost, just ordinary hot dogs, and as a result of eating one hot dog and drinking one soda when they do their monthly Costco trip, they will develop chronic illness and need to pick up prescription drugs there? Even if you're that much of a sociopath, there are much better business models.

With misguided expectations so low, you give up any motivation to hold companies to a higher standard.

In fact, companies usually prioritize earning above almost anything else, but there are exceptions. CostCo is one of them. They spent a long time paying their employees much, much higher than stockholders wanted them to. CVS is another, giving up tobacco sales at great cost to focus on health care.

It's possible to be cynical about these or any other things, but it is clearly untrue that every corporation cares only about its own bottom line.

Individuals also don't care anything but their bottom line, so this whole line of reasoning is void of meaning.