They do now anyway. Recently I watched La Blogothèque's segment starring the Brit-Folk group Noah and the Whale. I have followed the band for what has almost been a year, and they remain pretty consistent with pop-folk melodies. Their songs, which have been likable, are not something that I would think would evoke this type of behavior on stage. Granted, they are no KISS or AC/DC, but for what it is, these guys give a great stage presence.
Check out the vid.