We paid a group of editors once and it didn't turn out the way we wanted it to. We mainly did it because our schedule for one of our YouTube series' was packed - we were trying to edit footage and turn it out in time for the episodes release date, but there was so much we just had to outsource and get a group of editors in to do it. However, the results were mixed. The thing about editing that people overlook is: it's a completely personal thing. You sit in the editing suite and literally obsess over every angle, every shot, every musical cue, and so forth, and so if anyone else was to come in and go, "Nope, change this, that, and the other", you'd flip.