The sacrifice is giving them to the god, rather than to one's normal uses. As an example, the invading Israelites dedicated several Canaanite cities to the LORD. No prisoners were to be taken, and the loot from the city or their bodies was to be burned.
All RW communities sacrificed less valuable objects as time went on. By the end of the pagan period in the Roman Empire, only gladiators or a few escaped prisoners could be viewed as sacrifices (see The Golden Bough for the escaped prisoners).
Obviously, sacrificing something really valuable is better for a given quantity of victim, but sacrificing the enemy usually makes up for it in quantity. "We Varmandi can only afford to lose a few of us before a battle, but we can sacrifice as many Orleving prisoners as possible during or afterwards."
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