Hi tuc,
The parable that follows on from the pearl is the dragnet, which I think speaks into this issue, see below........
"Again, the kingdom of heaven is like a dragnet that was cast into the sea and gathered some of every kind,
"which, when it was full, they drew to shore; and they sat down and gathered the good into vessels, but threw the bad away.
"So it will be at the end of the age. The angels will come forth, separate the wicked from among the just,
"and cast them into the furnace of fire. There will be wailing and gnashing of teeth.”
If we take what the Lord says here about seperation of wicked from just (righteous), you would have conclude that if the pearl refers to every individual human, then He will be casting many pearls into the fire.
I think the pearl refers to just one and it makes more sense that it is His church, His bride.'He purchased His church with His own blood'. It could also easily apply to Himself who is so precious it will cost us everything, as has been said by others. "He who loses (gives up) his life will find life". The scriptures seem to back up these two options in my understanding.
I do believe all people are valuable to God and understand that "God so loved the world He gave His only begotten Son" to save them, but I just don't think this pararble about the pearl is about that.