Good question. Here's what Gary Gillman has to say on that matter.
I thought I had read that somewhere, but I didn't want to pass along any misinformation. So, are we here in the US simply paying a "premium" price for extra-aged Alberta Premium? Not that I'm complaining, as it's a very fine whiskey.
"I distrust a man who says 'when.' He's got to be careful not to drink too much, because he's not to be trusted when he does." Sydney Greenstreet