Why should I care about ogg vorbis?

You shouldn't. You're an empeg-car owner, and your hard disk storage capability is very large.

Ogg supposedly sounds better than MP3 at a given bit rate. But that's only important if your storage is limited. With an empeg-car, since you have so much storage, you can encode MP3s at a very high bit rate, and not be able to tell the difference between an MP3 and an OGG file.