What do you have against WASD?
I like having my hands closer togeather, I don't like having a full size keyboard between my hands. Also wasd don't quite line up like the arrow keys. (I started playing FPSs back in the doom days). By using a key pad, I can use wasd as far as the game is concerned, but I also get what is for me a more comfortable hand position. (More like the postion both hands would be in while typing.)
It's a personal thing, and I can understand why some people never shifted from using the arrow keys to wasd, but most of the time you will start running out of keys in that part of the keyboard which is why wasd is so popular. Anyway I have a happy medium now, the G13 also has the logitech screen which is useful to see who's joined vent etc etc.