The extended music video is an interesting genre... difficult, to be sure. Sometimes the three minutes of video to a song aren't enough to hold one's attention, so why risk it at 10, 15, or even 20 minutes?
The new Rilo Kiley video for "The Moneymaker" doesn't suffer in it's length. It presents a very long and interesting background that at times is even more interesting as an exploration of the porn industry than the song and part of the film/video that has the actual music over it.
Definitely worth watching: