I would rather hear a bunch of authentic bad reads from the clients than the same production guy doing 70-80% of the reads because apparently nobody has any quality control over the spot loads/breaks.
It does the client NO GOOD to hear his/her spot read by Gary Michaels and/or Mike Warner, followed by a spot read by the same guy as a straight read with music underneath. Waste of money.
The Client: "Wait! This sounds like one long 3 minute spot!". Nobody's paying attention.
It's not bad that it comes full circle and maybe a bunch of different people are writing the spots and not just the same copy person trying over and over to come up with a fresh concept.
"Oh, listen! It's Gary doing his Humphrey Bogart 'detective' voice again!" or a guy/girl spot that's run it's course: "Honey, where do you want to eat tonight?".
Keep people listening. "Quality" does not mean sterile or status quo necessarily.