One of the most compelling components in being a good Video Jockey would be the idea of being able to read and react to music trends. When we look at why certain VJ's are better than others, it lies in the fact that some are able to read the pulse of where current music is and where it is going better than others. The best of VJ's were able to walk the line between what is "hot" and what is "up and coming." These are ideas that the VJ's with longevity possessed. I think that looks are a part of this equation, however, VJ's have to hold a look that allows them to be pleasing to the eye, but not so much as to overwhelm the music. It's a challenging balance, but it seems to me that people seek out VJ's on both grounds. Namely, that they are a positive part of the music experience, but not all of it.
That is an interesting question. Here is my impression from watching VJ's from the early day of MTV.
1. For video, I hate to say this, but looks do matter. So, this is probably one of the most important things. I am not saying that one has to be a super model, but a person needs "something" extra, whatever that may be.
2. All VJ's who are successful have charisma. They have the ability to connect almost instantaneously with people.
3. Successful VJ's also have a certain level of intelligence. After all, no one wants to listen to an ignorant person.
4. Finally, humor is also necessary.