I do it 'cause I love the tactile quality of the whole process. From bulk loading the cassettes, to composing, to exposing, to souping and finally the whole process of printing.
I sit in front of a computer all day, go to meetings, discuss problems and solutions and catch up with a CrackBerry. Darkroom printing is my break from it all. I get to set up my chemistry, plug in my MP3 player and use my brain and hands to create something. It's tactile. As an added bonus, it's very inexpensive to do.
Just my thoughts,
Kent