There are a couple of positives for Youtube Red for me, but i'm a bit of an out there case when it comes to this. I use regular youtube to stream all my music whenever I am out of the house because Google Play, Spotify, Pandora and all those other streaming services don't have the songs I want because I listen to a lot of stuff from stupid sources that they just don't have. The no ads on mobile devices is a bonus for me. I don't have to bother hunting new music because all the music I normally listen to from my PC through youtube are already in preset playlists which is super helpful
This is only really possible because my mobile plan has an unlimited data cap though. If it wasn't for the face I had unlimited data I wouldn't pay for the service because I don't care at all about the Youtube Red content. I just wanna use it for streaming on mobile devices without ads and while doing other things on my tablet as well which is mainly reading.