I turned an old laptop into a plex server. If you have a personal music library, you should do this.
I don't want to pirate music, and I don't want to pay for every song I'll ever listen to.
Pay-per-play makes the most sense to most users. We can't predict which songs we'll listen to once or 1,000 times.
I re-purposed a Kodak Photo Kiosk thing to automate the ripping. http://www.davisr.me/projects/cd-ripping/
I'm glad I decided to keep the collection behind when I changed computers because Spotify is so much more convenient. I don't have to worry about downloading music or having the right device connected to the right server, and I've found more obscure tracks that I liked in 3 years of Spotify recommendations than in a decade of randomly going through the Internet.