Maybe it's just me but I don't really enjoy concerts where the performer doesn't talk to the crowd. We had that happen with Camera Obscura once in L.A. Not only did they not say more then a couple of words but the set was extremely short as well and my wife and I both left disappointed.
I think it depends on the music and the artist. Some gigs are just so damn immersive and all consumingly brilliant that someone saying hello (insert city here) and rambling on would just ruin the experience. Also artists who can hold an audience by force of personality, banal chatter destroys that.