In case it's not clear what motivates me to ask the question in the subject line of this message, I will quote your words:
But don't fool yourself in thinking that no one would die in war if there was always monetary value to life.
At the end of the day, you will never be able to quantify "bad" and determine what creates the best world.
If you take such a skeptical position, then can I presume that you don't claim to have enough knowledge to justify opposing the introduction of an international market for human slaves?