I agree with you GlennT but I also agree with UD. UD wasn't saying that video couldn't look impressive but 99.9% will not. Admittedly if a video is made professionally it can be an incredible promotional tool of course. To say otherwise would be foolish. But to make that sort of video usually requires a lot of time, planning and money, and even that won't guarantee it'll be good. Musicians spend big money as it is trying to make good audio demos and often miss out even though they are competent players. Making videos is exponentially more complex and expensive and thus has more chance of failing than an audio demo. If you have your own video editing suite and the skills to run it, then making a good video is certainly possible. But this is not the situation for the average musician or band. Putting still shots with an audio track is simply a safer bet for most people to make an AV demo.