>Yet they continue to parade out people who say they picture themselves equivalents of [ insert name of a popular singer ]. Then proceed to butcher a song made famous by said singer. Although I really don't even think butcher is strong enough here. And when the judges call these people on their absolute, total lack of singing ability, the vast majority get angry.

I think that's their sales pitch - they parade people such that anyone in the audience things they'd do better. Just like any quiz needs to have that illusion that J.Q. Sixpack could score some points in it. That explains two things:
- why does the audience root for total tin ears
- why there's no more a real knowledge quiz, just trivia