When falling from height, after a while you come to the height when height doesn't matter anymore (there is really no difference from falling 1000 meters compared to falling 4000 meters at the same spot).
its called terminal velocity <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Besides, falling doesn't actually hurt you. It's whatever you hit that's the culprit.
