Bad Dancers

I was thinking  why are there all of these competitions about who is the best. American Idol, who is the best singer. So you think you can dance, the best dancer, Amerca's Got Talent, the most talented. Why not a competition for the worst people. For singing it could be "Time to break some eardrums" or for dancing it could be im bad and i know it. you know. I just dont get it.