unless you move the suspension points in the car at the same time, you are only limiting the total distance the suspension can travel. in other words, no free lunch.
if you're doing this for cosmetics, do what you will, but lowering a car reduces handling in my experience once you move past a certain point. it's like sawing off a coil on the springs. you lowered it, great, but now you got less suspension. if your car was designed to move the suspension to absorb street conditions, you lessened that ability now.