This station is on an existing, operational line that would run trains on the tracks even if she weren't there (and this is what is going to happen once she graduates).
So the marginal cost of stopping at this station is actually not that large.
I was under the impression that it was the line that was underused, not just a stop on the line. I suppose that makes things pretty different, especially since I think Japanese lines tend to go out farther to pick people up in general.
So the marginal cost of stopping at this station is actually not that large.