You will probably regret not driving it while you had the chance.
To feel better, go price the difference between a 60k and 120k mile 964.
That is your hard number on what the driving will cost you.
You might like reading this
http://forums.pelicanparts.com/porsche-911-technical-forum/898302-has-your-911-become-garage-trophy-you-never-drive.html