I am going to assume you have never read the text that comes up when you select epic difficulty. Best of the best is not a fresh 20 with no gear, I might consider myself a great player but I am not going to drag my fresh level 20 Pally into epics until I get some Tod rings and hopefully an epic Sos.
Of course knowing your character is up to par is part of being one of the best, nothing worse then an extremely undergered player trying to join a tough raid/dungeon when all they are going to do is drag it down.