Japan is a first world country that needs to pay employees first world wages so the employees can survive. Unless you are an artist or a gamer. PC prices have plummeted to almost nothing.
PC's aren't a business for Japan, any more then they are a business for the US or Europe. PC's are going the way of consumer electronics, they can be built easily in low wage counties like China for now, and if trends continue, soon they will move down the food chain to – where?