And the deal with Cthulhu is that he gets to devour whoever you've sacrificed, and in return he provides a benefit to the survivors: allowing them to live long enough to provide more sacrifices. It's basically the same deal.

Also, if anyone reading this happens to be a seed on a fruit meant to be devoured by humans then I have bad news about your final destination: it's rather a stinky place that is not in any way conducive to your growth. The cake is a lie.