I'm not sure it makes sense to be concerned with whether or not a song was made by a singer or an engineer, or about anything besides the song itself for that matter.
Funny thing was, the band was not playing. Everything was tracked on 2 macs run by a chubby guy in a phillies hat on the side of the stage.
I'd argue the majority of people who go to these shows have no clue and will gladly pay their $50 just to see famous people and tell their friends.