As others have said, you are describing a totally imaginary world where money is the only cost. “Artificial” is doing all the work. But the very investments you’re describing are “artificial”, and more than that, they require constant spending to maintain. Why should cost at point of use be the only artificial incentive? What about the environment created by those very investments? The quality of roads, the cleanliness of the train? Your distinction is contrived in service of your predetermined conclusion.