(First Anon)

What’s your opinion on human sacrifice, /x/? Is it powerful magick?

Sacrificing humans works bc our blood is almost like a technology that facilitates communication between us and The Ones outside the material plane (beyond spacetime). To keep the "technology" analogy, blood rituals function sort of like a radio transmission. But like a radio transmission, blood rituals are also kind of basic technology, and we dont need to engage in them to use the power of our blood to communicate with higher beings or interdimensional entities. There are advanced practices for achieving the same thing, and which dont require the spilling of blood. Blood sacrifices don't grant power; they waste a valuable resource

(Second Anon)
Everything you're saying is correct. Although blood is a simple way of adding additional "oomph" to a ritual, I often give drops of blood to certain entities in exchange for favors.
With that said, there's a good chance it's spiritual currency, I could quite literally be selling my soul without knowing it as blood contains DNA, i.e. that which makes "me", me. Either way though, I'm already in too deep to stop, so I'll keep using blood.

And to add on to your original point, another reason they would sacrifice an entire living person as opposed to just spilling a little blood using a dagger is because the sheer terror of the victim being sacrificed creates massive amounts of energy for the entity in question to feed upon which in turn allows the entity to manifest and achieve the desired goal of the conjurer.

Even pricking your finger with a diabetic lancet like I do is unpleasant, not nearly as unpleasant as being fucking killed obviously, but that negative energy generated by the bit of pain I inflict on myself is powerful enough to manifest significant and impressive results.

t. LHP sorcerer.

(Third Anon)
Lame, no honor in claiming power that is not my own, I can get to the point where I can take on armies by myself and to steal someone else's power is dishonorable.