Well, look what it does to us...
We can argue adamantly for hours about silly things such as capacitors, which brand is better, which amp will give better sound, etc!
And on top of it we are cleanly divided by who knows it ands who doesn't.
There are noobs, semi-noobs, people who are fairly knowledgeable, then Guru like ultra car audio gods like Jack Frost, req and Squeek (to name a few...)
You could compare the car audio to the musclecar craze of the 60's, except instead of faster and flashier, we strive to be louder and clearer.
I have a video by Team Toxic Bass that would serve good for an intro! (chick getting her hair scrambled by 2 JL 13W7's)