The car is pretty well depreciated already, putting miles on it isn't going to hurt the value much. Drive it because it is fun, drive it all the time. That is what it was made for.
Current ride... '13 GTI Wolfsburg
BMW's from my past...
'92 535i/5 '89 325ix/5
'98 750iL '86 325(e)/5
'95 740iL '84 318i/5