Unless I misunderstood or am remembering wrong DV said in his first video about this build that it was not a build about HP/ $$$ spent. If you think that this build is about best hp/ dollar spent that would explain why it makes no sense to you. It wouldn't make sense to me either. But I don't believe that is what he said this build is about. I think that DV is wise enough to know that using a bbd 2 barrel is not a cost effective way to make HP. I do think that he finds that using the bbd 2 barrel and the other perimeters set out for this build both exciting and challenging. A fun departure from some of the same old builds he commonly does. In that spirit I'll watch and enjoy.