Justin messed up the whole video. He couldn't even talk correctly for the 5 second line he had 'p-p-perch-per-puh-fect' and as with every role he plays in any skit etc. he does, he has to be complemented or be telling everybody how perfect he is
Any chance they still have vacancies on that Mars One trip because it would be a great 'opportunity for you Bieber
Oh wait I just realized this That's the only reason this happened, most people don't know the music video even exists. That explains Justin and Carly being in it, and the others probably just want to be on Scooter's good side due to his managerial clout.
and as with every role he plays in any skit etc. he does, he has to be complemented or be telling everybody how perfect he is 
doesn't Scooter manage Kanye...