You can’t possibly expect a highly developed nation to have comparable prices against south east Asia.
My point is that there are many young Vietnamese hoteliers who would love to move to Japan and operate some of these abandoned houses as hotels. They will have to do all the renovations, cleaning etc. themselves, but they will earn much more money.
The largest obstacle will be Japanese regulation.
SE Asia is a completely different economy though. Japan is a first world country, and the third largest economy in the world. Its not going to cost the same as someplace in SEA.
In addition to what everyone else said about it not being a useful comparison to look at SE Asia, I also wasn't looking at the cheapest options. Capsule hotels would generally be available for half that ($30) and sleeping in a manga cafe would be $10-$20 depending