The Rave Ups - "Positively Lost Me" (forgotten song)

I've previously mentioned the juggernaut that was the 1986 Pretty in Pink Soundtrack, but did you know that one of the arguably better songs from the movie did not even make the cut for the soundtrack?  "Positively Lost Me" was from the 1985 LP "Town + Country" by The Rave Ups.  The band was featured in the movie, in the bar scene where the four main characters meet up, and "Positively Lost Me" was one of the two songs they played in the background.

A perfect 80s pop break-up song, I love how the song builds a line at a time:

You lost a lot when you lost me

You lost a lot when you lost me
Six paperback books and a dying tree

You lost a lot when you lost me
Six paperback books and a dying tree
A looking glass and a diamond ring, yeah

You lost a lot when you lost me
Six paperback books and a dying tree
A looking glass and a diamond ring
You lost me and you lost some dreams

How did this song get left off the soundtrack?  How did this song not become a huge hit?

"Positively Lost Me": studio version with movie footage, 2011 live version (they still have it, all that is missing are Duckie & Iona in the foreground -- you didn't identify with Andie or Blane, did you?).

Honorable mention: the brief snippet of "Rave Up, Shut Up" that also appeared in the movie.