That's the funny thing.
Gary (GMan) and I were emailing back and forth today about it too.
85% of my riding is highway touring, not heavy cornering and NOT driving like an idiot. I just don't do it and since I've got a passenger 98% of the time, I'm not cornering heavy or terribly fast either (which explains how little wear there is on the sides of the tire).
Hell, I got 80,000 km out of my factory set of tires on the truck too and amazed the tire techs!