because he is awesome I went to go see his movie (Never Say Never) and I cried 5 times through the movie. but we ike him because 1. good personality 2.his hair flip 3.He can sing and Dance 4. He followed his dreams. 5. He is so HAWT.
My theory is that they like him because they think he is hot. He plays catchy music that gets stuck in their heads. In all reality in about 2 - 5 years everyone will forget who he is and they will stop listening to his music. He is just another guy who is being used by the music corporations to make serious amounts of money. After his time is up no one will remember him.
He's a talented kid. People said the same of Elvis Presley hehe :>
I don't go crazy over him, but his singing voice is quite good, he's got a lot of charisma. All the more power to the guy if he's got a big fan following too.