Because there is a shortage of songs I like. I loop the same songs for weeks until I can find a new song
Why not read some music blogs or go to a record store, or talk to your friends about the music they like?
I don't share my friend's music taste and record stores for sure don't have what I like (its usually small soundcloud accounts). Also the things I like about a song are not genre bound, its usually very subtle things that are unsearchable, hence even of the songs I like I usually only like ~30% of the song itself. With a personally tuned reward model I can strictly focus on amplifying the subtleties instead of searching by means of exhausting indirection
I'm the opposite of you. I don't do songs, I do albums.
And there are just too many albums to go through each week. I'm on Redacted and Orpheus though, pulling the Top 10s each week.