Because, that's a release cel, a reproduction 
made from sketches they used to CG animation. I 
got one of those, too, see my Homura on 
http://sc.rubberslug.com... 
The image sucks imho, I mean, too much stray hair 
or orange cloth, but whatever...
Anyways, so this isn't just a nameless punk and 
the price is ok. Repros of Ririn are RARE, this 
is the first I came across.

You won't get an original, repros and release 
cels are your only bet... and fancels, but I 
don't do Saiyuki at the moment (too much work) ;)

^^