Mindy Kaling (Kelly Kapoor from The Office) is a famous diversity hire. It's not a theory; their show used a diversity hiring program through NBC, where if you hire a white person, it comes out of your show's budget; but if you hire a minority member, then NBC pays for their salary. So The Office had her on the writing staff basically for free. The catch was the program only paid for one year, so she knew from the first day that she had exactly one year to prove that she was worth the same salary as the other staff. Obviously she did, and was quickly elevated to on-screen talent, and her star just kept climbing.

But knowing she was a diversity hire made her try harder; that sort of thing can be very motivating to a certain type of person.