Spotify should add a feature that keeps track of skips vs. plays to me know what songs I should delete from my music or playlists.

Often times I'll find myself skipping a song for several months in a row before finally deleting it. I get into the habit of skipping it that I don't even think about it any more and am too lazy to delete it. I think it'd be useful to have a skips vs. plays tracker, so I know what songs I should delete. If I haven't listened to a song in 3 months, but have skipped it 37 times, why the hell is it still in my library? It's wasting space, auto-delete it for me–probably won't even notice.

This also applies to iTunes or other music libraries; Spotify is just what I use most.