Let's put it another way: when is that love not worth it? Is it worth $50 a trip? $100? $500? At what point do low ridership numbers to far-away places cease

Let's put it another way: when is that love not worth it? Is it worth $50 a trip? $100? $500? At what point do low ridership numbers to far-away places cease justifying the construction of dedicated fixed-rail infrastructure? (the highest of the high-density modes of transit) I may love taking a train straight to Paris, but that doesn't mean it should be a part of my city's metro system.