Let me throw this out:
Many, many, many moons ago, I watched an electrician wire a house.
He would take his tape measure around each room and measure up from the floor at each stud, marking them at 20" off the floor. Each and every stud.
Then he would take a square and transfer the 20" mark from the edge of the stud onto the 3-1/2' side of the stud. Each and every stud.
Then he would go back around and measure the center of each stud along that line. Each and every stud.
This way, when he drilled his holes, each one would be exactly 20" off the floor, and exactly in the center of each stud.
I asked him why he did this. "It saves wire", he replied. "I can come up out of the box, have enough stud to staple it, then have a perfectly straight line across the studs. And you know what they say about the shortest distance between two points is....?"
I thought 'this guy spends more time marking out a house than most guys spend boxing, drilling and roping it.' Yea, he may save wire. Maybe a couple bucks even at todays' prices. But he wastes an entire day just marking up the studs.
Neat work? Heck yea! But it was a total waste of time.