Sometimes it is in the best interest of the client to have them record their commercial in their own voice to establish trust and credibility with your audience. It's not about production quality, or voice quality.
I'm certainly not making a blanket justification for a number of the bad, screaming, non-funny-trying-to-be-funny auto dealers out there. Those guys just like to stroke their own egos; they are successful at one thing and think they are equally amazing at everything else they touch.
Yes, sometimes its just the money.
But, if you're in our industry, and you're truly trying to help a client be successful, there are times when their own, sincere voice delivering their own message [with copywriting help] builds a connection with the audience. I'll give you one example many on this board probably aren't familiar with.
There is a realtor in Indianapolis by the name of Kristie Smith. She markets herself well, with a nice web presence, a monthly decorator magazine published and mailed to her database, an email marketing strategy, and she uses radio, specifically Radio Disney. She voices her own ads. Her copy is contemporary, addressing the current market conditions with straightforward messages. She has a pleasant voice, and is a good public speaker so she can read the copy well. She identifies herself as delivering the message, and doesn't come off as just reading a script. In short, when you hear her, you know she is really trying to connect with the listeners. Radio Disney is a good station for her to be on, with high concentration of moms [families with kids]. But that in and of itself wouldn't be worth a jar of beans in this economy for a realtor. The fact is her "brand" is through the roof [bad pun]; her market recognition is very high [she's recognized all the time in the course of her business], and her business GREW last year in this economy. She has connected with this audience, and consistently continues her advertising to maintain, even further build that connection, and credibility with that audience.
It's only one example, I know. But, isn't this what we claim is the strength of advertising on radio? Not necessarily the best production piece [whether done locally or agency produced] but connecting with the audience, not just throwing message after message at the listener that they tune out?