The Blood Price/Holy debacle should really only be an issue for the first pull.

If I pop Blood Price and see the WHM start their Holy spam, I chide myself because the healer is going above and beyond providing DPS. I typically wait in the future pulls for the stun lock before throwing it on, and avoid using too many AD's or DA for for the 10ish seconds it takes for stun resist to form on the mobs.

Alternatively, if I'm on WHM, I tend to swap out to Blizzard II if I notice the DRK is going to pull with Blood Price regardless of the fact I'm trying to DPS.

The real message here is: Be flexible. It's not about whether Blood Price is more important than Holy or vice versa. It's about being a good team member.