While I understand the sentiment, as someone with both an unusual music and film taste, doing what you think I should do would probably mean a lot of what I like would be lost forever, and it would be a shame.

Medianis ephemeral, but art very often not so much. If someone decided to throw the works of Bach or Beethoven away we would have truly lost something for example.

Of course not everything is art to everybody, not everything has value to everybody but there are things truely worth of preserving — and often for other reasons than we ontuitively would think.