A person who wants a show approaches management. They negotiate a time and fee. Then the person sells ad time on his own. If you're doing an ethnic show, you appeal to business leaders in your ethnic group, grocery stores, restaurants, clubs, or maybe just a businessperson who want the pride and goodwill of supporting a show within his/her ethnic group. Or if its a religious group, the preacher will seek contributions on the air. Or if you have a service, financial advice, home mortgages, law, medical procedures, you advertise yourself and wait for folks to call you for an appointment.
I think most people, even those in our industry, don't fully know how stations that would otherwise be bankrupt and off the air do this and stay in business. Who is listening to these AM stations that either have so-so signals or, like WWDB, are daytime-only? They actually patronize the producer/hosts, enough for them to make a profit for and the station owner to make a profit. I don't know how, but it seems to be working.
WWDB is owned by Beasley, a major broadcasting company. It really isn't connected with the original WWDB talk station at 96.5. Beasley simply got those call letters when nobody was using them. Beasley also owns WBEN-FM, WMGK, WMMR and WPEN. But they are not above selling time to a dubious financial guy or miracle-worker doctor, to help WWDB turn a profit.