When you say “Original Settei” do you mean the 
original hand sketches done by the character 
designer, or studio photocopies that may include 
some original notes, or just studio copies?

Because the original hand sketched ones tend to 
be very rare and I have seen single sheets (1 
page) sell for the prices you are listing for 
very large groups of them.

It makes a very big difference if something is a 
photocopy or not.