I think a lot of stations that flip to talk on the FM dial do it purely out of economical reasons. Once you flip from music ASCAP fees go away, you don't need local voice talent or even pay to voice track. You don't need someone scheduling in selector etc....
If you are already a second tier talk station you don' have to worry about picking up Rush or Hannity and the fees that go along with them so basically you're entire lineup is on barter which is fine because you have plenty of empty inventory. Basically you are trying to make enough money locally to pay the electric bill and the one or two programming salaries you have to pay.