Basically because every time this happens the burden of debt is passed towards the tax payers. They just built a long toll lane in my city in what was a 2 lane highway. Adding another lane or two would have alleviated traffic immensely. The company that built it owns all profits for approx 50 years. What could have been a 5 lane highway is still two except now you have the option of paying a ridiculous amount of money to not have to deal with the traffic. This is money that could have been spent on improving the city’s other methods of transportation, trains, bicycles, etc.
It doesn’t affect me personally. I ride a motorcycle every day. It’s just painful to see how private interests are almost never in line with what’s best for constituents