What accounts for the fascination with Elvis?

There is a scene in the film Pulp Fiction where Uma Thurman’s character says that the world can be divided into Beatle fans and Elvis fans. I belong to the former group. I do not care particularly for Elvis’s singing style, but for the sake of argument I will accept that he had singing talent. What puzzles me is the fascination with his persona. It is not just the singing, but his entire style and appearance that people try to emulate. There was just a worldwide Elvis competition. I can’t think of anything comparable for any other performer. His home at Graceland has become a kind of shrine. What’s the deal with all this?