Exchange rates and .Mac

Every time Apple updates one of its products, it also updates its non-U.S. prices to reflect the exchange rate. This means that as the Canadian dollar has risen, their stuff has gotten substantially cheaper in Canada. With the Canadian dollar trading at nearly 95¢ U.S. lately, prices are approaching parity — in fact, in some cases they are at par. This week, after Apple’s product announcements, both iLife and iWork cost $79 ($99 for the family pack) — the same price as in the U.S.

So could someone please explain why .Mac, which costs $99 in the U.S., still costs $139 in Canada? (It’s at least one reason why I let my subscription lapse.)