Why do you save music you wouldn't favorite?

Just had this thought. I have several thousand songs saved in my library with something like 500 songs favorited.

I generally skip music that I haven't favorited when I shuffle play & can't think of a time I'd want to listen to those tracks. But I don't want to remove them from my library.

I usually favorite songs that I really like or songs that fit a playlist well. And those are usually the only songs I ever want to listen to. My most played songs each year are almost all exclusively favorited songs.

Just a thought. What's your motivation for keeping songs that you don't favorite?