The fact that Clear Channel (and other radio companies using syndication/networks) sometimes use "actors" as callers never came as a surprise or a concern to me when it was revealed years ago.
Creating "skits" for play on the air to increase the entertainment value seems perfectly fair game to me, since it's all about creating an experience for the listener.
As long as you don't promise on the air that "every caller you hear is real."
That's why the KISS 108-Miley Cyrus flap is a different matter for me at least.
Deceiving listeners is beyond just bad PR.
It's bad business.
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2 weeks ago