Yes, I think in general music videos and television performances increase album sales. That's their whole purpose. I rarely watch MTV (once every couple years). The last time I did, I stumbled onto the video for "Mr. Brightside" by The Killers, and I totally loved the song. It sounded so 80's. So, I went out and bought their first album. I cannot see this example being isolated to me alone. Oh God, is it?
I think it's the production values, or lack thereof, which some of us bemoan. Look, at this point my musical arrangement with Morrissey is like a marriage: I'm sticking with him through better or worse. So again, another video of him and the lads walking around lip syncing to a rocker of a tune. I'm a die hard so whatever, it's not going to affect my purchase of the single, or new album, or Southpaw Remastered. Those purchases are all guaranteed. However, I can't help be left with the lingering notion if only he'd have taken videos more seriously, I think he would have a justifiable case for his music not charting higher. Which I bring up because Morrissey ALWAYS brings up.