The way most stations handle this is using the morning show voiced spot in other day parts. This is very common. Surprised you've never heard it. K-Rock did that with Howard Stern spots. If there's money to be made by host reads, there will be a way to do it. You don't turn down money. Even syndicated hosts such as Elvis Duran or Ryan Seacrest, read live spots for the local affiliates. If advertisers will pay for live reads, radio stations will hire more live talent. However, some agencies feel their produced spots are more effective than dry voicers.