User blog comment:B214/Question and Answers 6/@comment-24098614-20161212223522/@comment-10330822-20161213095938

From the sound of other devil contract-like series, devils get higher status in hell the more souls they steal or take with contracts. However, in the Rating Games, you get the points simply for fullfilling the contract, meaning the entire point of taking the soul is lost.

I wonder what they used to do with the soul, once it was stolen. Did they consume it to grow stronger? That's something that might be interesting to go into later in the series, because it means even the older devils from the Anti-Satan Faction could have eaten human souls in the past.