I buy ~20 drives/month (a drop in the bucket compared to you guys), but I find 6TB drives are fast, reliable, and cost the same per TB as the 4TB drives (so, ta

I buy ~20 drives/month (a drop in the bucket compared to you guys), but I find 6TB drives are fast, reliable, and cost the same per TB as the 4TB drives (so, taking the NAS/Pod cost into account, cheaper per online TB). Are 4TB drives significantly cheaper for you? Or is there some other constraint at play against the 6TB?