Delay of the real eatate information disclosure

Why does the investment from the foreign countries not gather more in the property market of Japan?
Of course, one of the causes may have an earthquake disaster risk.
However, there is a basic cause for Japan.
It is lack of the information disclosure of the real estate contract price.
As you know, after 2013, a real estate agency can surely confirm it in REINS, but the commoners can not.
The information disclosure of interest contradicting between buyers and sellers is not made open in Japan.
The information disclosure of Japan is behind Europe and America very much.