$10/month really isn't much. Compare to buying music, that's less than two album downloads from Bandcamp at normal prices. For those $10 you get completely unlimited access to all the music in Spotify's library, generated playlists and radios based on your tastes and listening habits.

Honestly, 10$/month is bordering on suspiciously cheap for what you actually get.

It's the same sort of odd psychology when it comes to paying for apps compared to paying for dinner. $2 for an app seems expensive, but $50 for a dinner for two is generally not even questioned.