In factoring the cost of war, what are lives worth?

War is expensive, I once read that for what it cost to kill a Vietnamese soldier, we could have bought each one of them a 3-bedroom house and a car, or something like that. We might have been able to buy the whole country. It’s not unthinkable, Zionist volunteers bought Israel lot by lot, house by house. A Wagner mercenary is paid twice what a Russian soldier earns. In other words, they fight, suffer and maybe die for less than $600 a month, with no pension or other benefits except what they can steal.