I think there's still some value to running a local TV station's 6PM newscast audio on a news/talk radio station, if the only other "cheap" option is to run some canned/prerecorded/national/regional/whatever news. KRLD has done this in the past, and of course, several Spanish stations have run WFAA-TV's news en Espanol over the years ("Ka-Essie-Essie-Ah, Ah-emmy...dosi se tenta!")
But to run CNN, 24-7, where-is-as-is...no good. CNN, by nature, is too "visual." It's not designed for radio. 1190's done this before, way back when...KUII/KYII or KGBS, one of the revolving door of call letters in the early 1990s there, ran CNN's audio, and it failed, much like it does now. For Cheap Channel, CNN's merely filler until some moron (or perhaps a nostalgia freak with too much money to spend) comes along and buys 1190 (the rich nostalgia freak would immediately flip it back to Mighty 1190 with live jocks, of course.) CC said 6 years or so ago that the lone AM station in their DFW cluster is the odd man out. They pawned it off on First Broadcasting to sell it for them, but no one would pay their insane asking price ($20 mil? seems to ring a bell. That's why no Spanish or other foreign-language interest has shown any interest at that price.) After First put music back on it, then staffed it briefly during their country format, then stripped it back down to a hard drive again, CC took it back and put CNN on it. So my two cents again....it's just filler. Easier to sell a station that's running something, as opposed to one that's dark. Then again, what's 1190 worth now, adjusting for the RADIO-STATIONS-ARE-NOW-WORTHLESS factor? $1 mil? $8,524.12? $62.50? Nah, they'll just TRADE it to somebody for THEIR worthless property in another town. Maybe they'll do another donation deal like they tried recently elsewhere...give it to a group that can't even afford to turn the xmtr on.