Ummm, there is not just one good thing about being a VJ, it is a package deal. It is a fun job and you get paid to party and have a good time and make people have a good time, which is great.
Although they might not admit it, I think girls are very aware of the impact that they're having. But they never feel it themselves, and it's impossible to explain. It's like trying to tell a blind person what yellow is.