Actually the pyramids were built exactly because of the pharoahs. Try building one now. You can't. Because there is no divine inspiration demanding the people do it.
"Why would you attribute an increase in sales or profits solely to the leader?"
If you meant something similar, then fine, but if not, then do you really believe that the pharaohs would have been able to build their pyramids without their work force? As for whether we could build one now, I think you might say that we just have different gods [0].