[dredmorbius]

Truth on the rural markets, though I suspect running those translators is pretty inexpensive. I've got to say, having made more than a few cross-country trips, that finding myself within range of an NPR station rather than just very tired C&W, bible, right-rage-wing talk, or Mexican radio is a blessing.

[kate_myers]

Disclosure: I work at NPR.

The cost isn't just for the translators however - most of our stations also produce content themselves that is local, and many produce their own shows as well. Those are not small investments, but a smaller audience in a rural area means fewer people to raise support from. Our Alaska stations actually band together to help keep radio going across Alaska, though population is thinner.