It is more cost efficient, however, it depends on the customers home internet connection. I rely on Clear when I'm in California, and I rely on my neighbors wifi router to access his internet when I am home (at&t is a crappy company). I don't have the ability to use a landline based broadband connection to have the service, although I would love it if I could. If I had DSL, I would have an Airave in a heart beat.
I grew up being an over-exaggerating person.