Reason #1: The Grammy organizers are still mad about the weird performance that Nicki Minaj put on last year.
Remember what Nicki did last year? She showed up on the red carpet with "the Pope" and then performed an exorcism of her alter ego Roman while she performed a new song called "Roman's Holiday." It was, er, interesting, to say the least. The Grammy organizers haven't forgotten it, either. On a night where they were scrambling to celebrate the life of Whitney Houston on super short notice, Nicki put on one of the most ridiculous performances in Grammy history. So, they must have decided to make her pay for it this year by snubbing her. And, let's face it: After last year's performance, she probably deserved it.