Yes, Yes I am now well aware that Japan loves clear file folders but like anything if you cannot find more of the specific product you're looking for *cough* AC Tokyo Art Folders *cough*cough* then they are indeed rare and hard to find.
Steelbooks are made in the thousands but some still become valuable.
Granted I think you would be hard pressed to find a collector that would be more interested in clear files than steels
The question with specific clear files is how easy to obtain are the specific ones you want?
So while the general concept of Japanese clear files for every little thing is accurate, specific clear files could be hard to find.
Btw that batman arkham city one is epic