I also considered doing this when I was running more camber in front and the wear was excessive on the inside. Unfortunately, I have had a tendency to wear out the rears quickly enough that it has always worked out about evenly. Also, Michelin keeps obsoleting tires so it wouldn't really help much. If you save your fronts for 6K more miles, then when the rears wear out, you still have to buy a complete set because you can't mix the tires.
I guess that JonB just has so many ARP awards of his own that he is just anxious to share them now. Maybe the Partsrack bought them in bulk?