Because the profit motive is a lie. Most people are not rational actors and do not pursue profit to the expense of all else.

That's two strikes against. Add that most people are also stupid and that means that even th3 ones who are profit motivated won't actually do things that create profit.

The profit motive exists at the top. But at that point the rules of profit aren't the rules of products and people. They're the rules of politically avoiding decapitation.