Maybe like 10 years ago, someone did a regression analysis to see which stations were most expensive to advertise in, when corrected for actual ridership starting or ending their train rides swiping in and out at those stations. For the most part, most stations’ advertising prices pretty closely matched the number of riders, with the clear outlier of the Pentagon station.

I can’t find that article anymore because Google search turned into dog shit, but this more recent article basically covers the contours.