Why does peril use the phrase "the graveyard of outdated popular culture" to refer to pink think

In "Think Pink" the author (Peril) uses the above phrase to describe things that easily go out of favor with the public, just as 'outdated popular culture' does. Certain items in this proverbial graveyard include pop stars, actors, actresses, shoes, dresses, and others. The phrase is meant to shine light on how disposable these things can be in society.