Yes, yes, “blood for the blood god” and all, but when you think about it, why would the blood god want blood?
I mean, they’re the blood god.
Presumably they already have blood.
You’re giving them the one thing that by definition they already have in great supply.
I don’t think you end up the blood god by saying “yeah, that seems like a reasonable amount of blood.”
Khorne cares not from whence the blood flows only that it flows