Because when you sell a car and keep the motor mounts, it will idle rough.
Or, is it that your "perfect" car is having a little trouble, already?
Maybe you should pick your "piece of junk" back up, and ditch the trouble-free cavy...
(motor mounts are shock absorbers.. they eliminate the engines movements when the twisting forces cause it to try to rock, etc. bad or missing motor mounts cause the car to vibrate because it is absorbing the movements of the engine into the frame.)
Ray
