I would say this is nothing short of realistic. When a giant meteor is threatening to crash into the world, one would expect many to hoard cash while many others would hoard items. Also, cash would inevitably be destroyed in such an event, so that could be used for adding further realism. But more to the point, it's not going to change anything's real value. I mean, I just don't get the outrage - some people are intent on being angry despite things being explained quite clearly. I wonder if these people would squeal like they won the lottery if they moved to Japan and got millions of Yen. I mean, really now... it's exactly the same.