Over here everything is about business.  Over there they all get into the spirit and joy of the celebration. They want everyone to share the happiness.  So one way to do this is to lower prices.  Also a great opportunity to clear stock.

Over here the mentality of profit over everything is  making it impossible to happen.  They know demand will be higher, so put higher price or maintain existing price and they will make tons of profit.  Even if Sony/MS/Nintendo make it a worldwide price drop, some sellers will find a way to make it not available to everyone. 

Eg. The price drop is for new stock and its not arrive yet.  All they have is old stock and its for the old price.  When the new stock arrive, the promo is over and its back to old price.  Unless its a permanent price drop.  You know the drill.