ok so the problem with mounting them back from center is that the sidecut is symetrical, and your boot center wont match the sidecut of the ski... thats wrong and not how the ski was intended to be mounted. I think we can all agree on that.
However hows about one of you know-it-all's explain to me how that is any different that you mounting your skis center when they are ment to be mounted back from center.
that kid isn't doing anything different that most of you do. he is simply mounting his skis the way he perfers them.