A lot of users here, including me, have terabytes of uncompressed music. I have 320kbps copies for portable use that still take up half a terabyte. 64Gb isn't enough, even after giving up my (perfectly justifiable) audiophile conceits about lossless formats. Sure, I can curate my collection by picking what to bring, but I invariably forget to load something I later wish I had. Space is cheap, why not just carry all of it, all the time?
Whoa. That's quite the collection there.