Apart from many reasons mentioned by others, I find the "nearly unlimited" catalog to be very overrated. Every time someone asks me to queue a song, it's on Spotify maybe 50% of the time - as soon as you start delving into dance/single-oriented genres of the past, streaming services just won't cut it.

For the record (heh) I also have an extensive vinyl/tape/CD collection in addition to a few TB of pirated FLACs.