I would tend to say that people with that much music are:
a. Never going to listen to them all in their life time
b. bragging about all thier space (but we can laugh back and say that you wasted a ton of $$.)
c. in need of more free time
d. obviously have doubles triples and quadruples of the same song.
e. Have songs they dont like just to make thier list bigger.
I myself have 10.4GB of music, and that is ever being sifted through for crap and what not, I plan on dropping down to 5 or so some day.
I'm not knocking music, I think its just another way for people to brag.
:end of vent: