I mean, people had a hissyfit when Apple lowered the price of the iPhone, what would happen when people find out that the exact same computer they bought yesterday just got cheaper? Would Apple be expected to constantly send out credits?
I think you are wrong there. The real fact is that this time it's currency fluctuation and not Apple's authority on prices. Which means that we should be paying the value of the good the price it is. So yes, in the best world, they should be aware of that fluctuation.