1) it's a fabulously gorgeous, evocative, and 
darned meaningful film...
 
2) it's Miyazaki.  Who is generally considered 
one of the gods of anime.

3) it's Miyazaki.  Who just won an Oscar for his 
anime.  Probably the first Japanese anime Oscar 
ever (I'm not 100% sure on this)

2 out of three guesses say it's the name :-)
Same way you'd pay big BIG dollars for an 
original Disney animation cel.  Done by Walt, I 
mean.