“Artist manager Ian Montone, whose charges include the White Stripes and Vampire Weekend, says his bands aren't crazy about playing to a wall of cameras. "Having the first 20 rows of an audience standing motionless and acting as ersatz cameramen can be obnoxious to the artist, other fans, and takes away from the concert experience," says Mr. Montone.”

http://online.wsj.com/article/SB10001424052748704129204575506281834570988.html
 
I’ve never seen this at concerts I’ve been to.  Changes perspective somewhat.