Sir, Winston Churchill. Your denial of this issue is "nonsense."
I too have this issue and it clutters my playlist.
In fact, I have been listening to my Playlist and on occasion for reasons completely unknown to me will play some of the purchased music even though I DO NOT have it on my playlist. Therefore, I can only conclude, the music is still available for play when I clearly do not wish it to be available at that time.
For reference: I have many many songs that I have bought in hard format (CD's) and many many songs I have bought from iTunes. I am one of those listeners who likes to track how many times I have listened to a song. When my play count suddenly has a track at 1 listen I get curious, especially when it is a favorite of mine that I know I have listened too many time previously.
So, not only does it clutter, it messes with my tracking.
Thank you. Now I will continue reading these posts to try and resolve and completely ignore your "nonsense."