Low profile tires are awesome. Anyone who cares can see the massive trend we have gone through in the last ten years toward low profile tires. Even the car companies have been forced to produce vehicles from the factory with a much lower profile tire installed.
Along with a sleek look and a boost in the feeling of self worth, low profile tires do have a purpose. Allowing for a tire to stay the same height with a bigger wheel size provides a number of advantages. One of the biggest would be the possibility to have bigger brakes and rotors which in turn creates a much better ability to stop the vehicle increasing safety for everyone on the road.
Low profile tires can also improve handling in some cases. No not 30's, but the right combination of tire diameter and sidewall can give you optimum results in performance while still giving you a comfortable ride.