Nonsentient undead cannot be used in the DoB ritual.
The assumption that they could be used for non ritual sacrifice is just that; an assumption. And even if it were the case, it would give piddly amounts in HD, and in addition would be geographic based in direct boons or a small upgrade of a pre-existing artifact locked into domain.
Yes, I know who I'm talking to. Neither of those statements will dissuade Duesal from shucking every scrap into the compost bin if he can manage it.
But there's extra logistics in herding around zombies and skeletons and other shit, which I'm not even vaguely interested in bothering with when the rewards from doing so are negligible.