The guy told me warping the rotors usually should not happen as often as I was. and I didn't go to track, and drive not very fast or like to do late brake or brake in sudden... So I doubt that something wrong with my car... anyway, drilled holes will help in cooling the rotor at least, and that's the first reason I try it.
The second reason is it looks cool too.... lol
(Similar case as my friend, he drives an audi. Each set of rotor for each year... so after out of warranty, he changed to BBK, and hadn't need to take care of the brakes for some years already...)