I remember being "Top Graded" as an "A Player" when I was at Rackspace. In addition to everyone quickly beginning to hate me, I caught an article on Top Grading in the next few days which said that A players have an average tenure of 3 months, mostly due to the fact that we shake things up and are unafraid to challenge anyone, which eventually gets tiring. B players are loyal and anyone who has actually read on how all this is supposed to work realizes that C players are just in the wrong job, possibly even at the right company. They're unhappy and they stop trying, unless you can redeploy them.