You can go to this website to see a video of the "Back to the Future" hover board scene.
In this scene the guy is being chased by the bad guys and he takes a girls hover board to escape. But does he get away?

I think they don't come back because they think they are to good for the uglies and that they don' want to show their face there because they think that they will be made fun of by the other pretties.
when they get the morph or surgery their skin is peeled off their bones lifted in their cheeks and then they get all new skin for their body.