It's just that the current casualty ratio is slightly low. According to their statistics, the number of dead Proxy Agents is currently less than two hundred...
The agents have received too much amplification in the Great World, plus the protection provided by the Mist City Hell's Will.
Without this protection, the number of deceased agents would have increased tenfold at least.
Although the casualty ratio is terrifying, as long as the agents continue to die gradually, it's fine. The more the agents die off, the weaker they become. Moreover, along with their deaths, some of the equipment they strengthened with the Disintegration Crystals was acquired by the Boundary Breaking Organization.
The perfect Twilight Creations hold such research value.
Such fights maintained over a decade or so do not bother the Boundary Breaking Organization at all; they are even willing to sustain them for that long.
