I'm currently on a bit of a "get legit" roll when it comes to my media. All my software is acquired legally via the net so that's OK, it's just stuff like movies and music that I still require an optical drive for. Why?
1. I like my music in FLAC format. There are very few digital music stores which sell in this format. My favourite by far is http://bandcamp.com/ but they don't have much mainstream/big-artist stuff.
2. Even if I didn't have a preference for FLAC, there aren't any legal digital music stores around which service my needs with at least a high-bitrate MP3. I don't want to use iTunes because I don't want to deal with AAC (I can convert them but I don't want a dependency on iTunes anyway). Amazon still hasn't, for whatever reason, opened an MP3 store here in Australia yet despite promising to open up to the world many years ago.
3. You can forget about any legit digital movie stores selling non-DRMed stuff either.
So what do I do? I buy music CDs and rip them to FLAC. I buy DVDs and use HandBrake to convert them, or just play them directly with VLC. Both of these cases require an optical drive, and until such a time occurs that physical sales of media are completely abolished, I will continue to do this. UNLESS... a suitable online store apears in my area which sells non-DRMed music AND video of what I want, in my preferred format. At this rate that's going to take a very long time (if ever), so I do what I can to stave off piracy.