^^ Hey, this LIVE ALBUM is 100% live...
lol just kidding
Releasing the LIVE CD is not only about the vocal is also the arrangement. Many artists released LIVE CD contained lip-synced tracks to fulfill the albums and that will persuade casual listeners to buy them. Can you imagine an A BEST LIVE album without 'poker face'? And do not try to find reasons why they're not singing
that songs LIVE, it's the artists personal reasons.
So... enjoy the show!!