"Infomercials..sort of. I heard one station that lined up advertisers who got commercials and talk shows. Think doctors, lawyers, auto mechanics, tax/CPA folks, counselors, flower/garden nurseries and the list goes on. The format is 'help' talk shows where the 'expert' is the owner of the business that buys the advertising package on the station."
It was actually tried a few years ago on 990 AM in Providence, RI. The station went dark late in the last decade, returned for a while with a Spanish language format, went dark again, and it's been on and off for the last year and a half.