I don't know why it took me this long to articulate this thought, but Tesla's charging model is ultimately a trap for themselves:
They rely on other folks to provide services near their charging sites. That's clever, BUT it means they do not make any money from those services.
And that's precisely what keeps gas stations in business. They compete with one another to such an extent that the fuel is sold barely above cost, and the store/car wash/cafe is where they /actually/ make money.