Transportation is one cost that somehow gets hidden as you model these things. If you were building in Mexico and it took two days to get to the United States and now you are building in China, it will take three to four weeks by sea.
I really think how many times a quarterback gets hit is more important than sacks. It's all about establishing the quarterback's confidence in his protection. When you allow him to get hit and get hit early, he loses confidence in the protection. And why shouldn't he?