Search:

Two words -price tag

at auctions in Japan
The much more rare western Tamahagane Iwasakis go for 1000-1300 USD in NOS condition with all the paperwork and box. For ~ $800 you can get NOS western with no paperwork (HRC...

Why?
You can get #13 DT for a lot less here in US. Iwasaki Tamahagane Kamisori are not worth 3-4k USD, you can get one for 600-800 USD.
NOS Japanese razors pop in the classifieds on a regular...

considering what he payes for most of the razors prices are pretty high.

There are a lot of razors to be purchased in Japan, so he will not run out soon.