(Bearing in mind this is my opinion. As an owner 
of a set of copied Fruits Basket settei and 
storyboard.)

The appeal of settei/storyboard copies and even a 
large set of copied genga is getting to see the 
artwork and the part it plays in the whole 
animation process. Sure they may be copies, but 
in the case of the settei/storyboards they may 
have been made by the studio itself and sent 
around to the animators. (But, of course, it 
could just have been copied by someone else.)

Even though a set of 233 genga may not have much 
value as far as a collector's item, I bet it 
would be HIGHLY fascinating to see. It's a 
glimpse at something that you would otherwise 
never get a chance to see.