People tend to misunderstan the scenario for consoles in China before the ban was lifted. Consoles ALWAYS were sold in mainland China, and China is pretty much a PS territory (for consoles anyway), and PS brand was already pretty strong there. When the ban was lifted XB1 was the first to be available officially, but this doesn't mean much, even sales wise, the grey market still much bigger than the official one. 

I don't think they invest any money in Japanese market right now. So you should only count what they lost when they shipped the consoles. As someone mentioned above it doesn't seem that they sold initial consoles shipped which is ~100k

It costs money to maintain XBL for that market and run custumer service and what have you. Plus they have a board and various staff to run thngs just like any other market a game division branches out to. Oh sure it may not be very busy, but MS actually pays people for these positions. Likely adding up more over any customers they hope to get. 

Customer service is one for all Microsoft products I believe including Windows. Which I believe the most popular OS in Japan like in any other country in the world.

Yes, all that stuff is under the Microsoft umbrella, but there are localized specific functions needed for the Xbox brand in any market it's in. It's not just dumped in the laps of any MS employee. 

Also, consider this, given that the average cost of an Xbox One in Japan is $300 USD, they've only sold about 20 million dollars worth, and that's probably at a loss. So any money coming in for the division there has to be through games and Live accounts and other transactions. And it can't possibly balance out. The Xbox division is still there mainly to save face. But, that's job security for thoise employees in the meantime.

Launch alligned, I'm sure it has outsold WiiU, which has been out for 14 months longer in Japan. Though even counting that head start, another week like this would put PS4 past it. That said, this looks be the worst selling Xbox and Nintendo console in Japan as well. And I think the drop off from the previous consoles is bigger for Microsoft and Nintendo as well.

PS4 has sold ~29,4% of what PS3 sold.
WiiU has sold ~25,3% of what Wii sold.
XBO has sold ~4% of what X360 sold.

That's a massive drop for Xbox, and while both it and WiiU have no future in Japan from here on out, PS4 will keep selling for some years to come.

The Japanese market extends beyond Japan. Which is why Japanese publishers refrain from putting some titles on Xbox even outside Japan, like the Persona series. Japanese games is part of Playstation's appeal worldwide. If Microsoft give up on Japan completely, the disparity in Japanese titles between Playstation and Xbox will only become worse.

Anyway, what Kerotan's numbers illustrate is not just that PS4 outsells XBO, but how poorly XBO is doing. Even compared to its predecessor. It has only sold 4% of what X360 has in Japan so far.