Hmm, it really depends which concert it's from. I generally don't listen to live compilations because the audience distracts me, lol. I know on the AHS DC++ hub, there are people with mp3 rips from all the concerts, so that's better than nothing.
I really like the ANGEL'S SONG, Teddy Bear, and Memorial Address lives mp3 from Arena Tour! Those are the only live songs I listen to from her.
Realistically, I don't see Ayumi releasing a live album because she releases so much stuff as it is. Part of the allure of her concerts is seeing the costumes IMO.