Well, ask the people who saw her live about her singing..
I dunno why you're so "OMG AYU LIPSYNCHED" especially when the DVDs are heavily touched-up/balanced in terms of audio, and that's basically all you have to analyze. It's like, ew. It really disgusts me that you automatically think that she lipsynchs it for basically no reason whatsoever other than "She didn't say "Come on!" this time"... eh, whatever. It's not as though what you say is true anyway.
I only have one AT07 news clip [there probably were more, but people really didn't seem to care.. and the evolution performance is also on tudou], and all the songs are pretty live-sounding in it.
News clip - MediaFire [now uploading]
Tudou stream of evolution + UNITE!
Extremely live. The audience is also extremely pumped. EXTREMELY!!!! Like seriously. She even does that "GO LADIES~~~" and "HERE WE GO!" thing. Even an "IKUYOOOO!!~" Watch the
AT07 Tudou streams if you need any proof that Ayu is a live singer or not..