Quote:
“ No one would ever need to buy an album ever again?”
If you are on the free option like me, then it's not forever, you only get to listen to a track five times, once you played it five times you are never able to listen to it again off Spotify. So if you have a few of your favourite albums on it, songs are going to turn the dreaded purple/blue colour eventually and you no longer have those tracks to play.
Basically I use Spotify as a test system - when there is an album I come across that I like the sound of, I take a listen to it first on Spotify and if I like most of the songs I will buy the CD, if not, I delete the album off my Spotify once I've listened to it and if there is say one song on the whole album I liked then I'd download it off something like Amazon.
For example I bought the first album from the band The XX, and wanted their second new album that was released a few days back and I can tell you I'm glad I had Spotify because I found the whole album one big giant bore. So will not be buying it at all.
I also use:
Last.fm
Youtube - if an album isn't on Spotify you can usually find what you want on youtube to listen to albums to see if you want to buy it or not.
^ As you can see, I prefer having the physical format over digital music storage only.