In a world where Apple Music, Tidal, and YouTube Music cost $10/month; Spotify could cost $30/mo before I would start questioning whether it is delivering enough of better experience to justify its higher cost. And, probably, $40/mo is the straw that breaks the subscription. That's how much better Spotify is.
I'll pay for Spotify Supremium whenever it drops. But, seriously, no one cares about Hi-Fi quality. I'm actually more interested in the bundled audiobook hours that have been rumored.
[1] https://getyarn.io/yarn-clip/f26113fb-c28b-4919-858b-f6e6600...