[Sombre]

I think people tend to overemphasise the amount of blood slaves you can drag in each turn. A well run blood economy can certainly produce a lot, but setting up that economy is no easy task when you're being raided, need gold for upkeep and other duties, don't have masses of efficient blood hunters etc.

Empowering a unit from nothing to high level in blood isn't as wasteful as doing it in another path of course, but it is still pretty crazy.