Professional singers should not be allowed to lip sync. Amirite?
If singing is what a person does to earn their living, then they should sing live without any enhancements or back up. Have you ever heard a song on the radio and loved how good it sounded, and then when you heard the live performance by the artist could not believe that was the same person? Because of all the enhancements that can be done to music and the voice for recording purposes, the REAL voice just doesn't sound great any more. UNLESS, of course, the singer really and truly can sing and has an incredible gift to sing. I want to hear the real thing - not a lip sync performance.