Reply to What's the importance of CDJ's?

I came into DJing in the last two years or so, and still can't figure out why people use CDJ's. Is it the appearance, is it the functionality.

The way I look at it is

Vinyl = being able to play 1 song at a time, rest in a crate
CDJ Ver. 1 = Play up to 20 songs on each deck
CDJ Ver 2. = Play an MP3 CD with 100 songs on each deck
Laptops / Control Vinyl = Play a whole library of music

Sure vinyl is a technique-filled skill. But why do clubs have CDJs still when I can program Traktor to have a full rang of effects and controls on my keyboard?