I don't think you'll be able to compete with Spotify for personal recommendations. But there's a fatigue that comes with being kept in your recommendation bubble. I want to hear something new and good and different! And not corporate-approved like Pitchfork (rip). Through the grace of god Hype Machine is still running and still highlighting some solid tracks.

Strangers' preferences can be better than a personalized recommendation, if they are cool strangers.

Last edit: I seem to remember a study that concluded that people who listened to a wider range of music types spent more money, or were more lucrative advertising targets. However, there are fewer of those kinds of listeners.