I WONDER HOW MANY RADIO (media) PREACHERS R PLAGIARIZING

Some of them put out such a non-stop constant flow of sermons & messages you have to wonder how they do it? Can they possibly come up with new material on their own so frequently? Or are they "re-mixing' old material with a bit of material of others? Some at least give credit to their sources,but others do not. Are they "copying" others in some cases? If so its a shame because it becomes more of a matter of maintaining the status quo rather than truly integral personal inspiration. But if so,more power to them!