I understand people like to have the black label games more because they look better on a shelf, but beyond that, I don't know why people are so anal about this. Lotsa my PS1 games are greatest hits, and I don't think they're worth any less then the black-label versions. Plus, they're the EXACT SAME GAME. I don't get it.
There's actually a collector on Youtube going for a complete PS1 greatest hits collection, and as a kid I remember trying to get games that were greatest hits, cuz chances are those were the best games. I just don't see why people are so hung up on this.