I don't know persay the value of these things. 
Personally, I wouldn't think they have much of 
any. (other than that it means something to the 
fan of the show) It is sad the high prices they 
seem to go for on Mandarake though. Original 
sketches I can see, but copies?! *_*

Can't speak for anyone else, but the reason I am 
interested in the settei is slightly dubious. 
^^;; Besides the fact that I adore "insert" 
series; I want them for reference material so I 
can make some fanart. But then maybe that's why 
others want them, who knows. ^^;; 

Just my 2 cents, (er maybe 5 sents!) :P

with kind regards,

Dustie