Also, once prices start going up, maybe people 
finally bite as 'that special cel that's been going 
around at a bit too much to afford' or the normal 
cels just become high at that the people who 
own the rare/very-nice cels from the series start 
becoming interested in selling.  Then we start to 
see tremendous cels that even some of the old 
collectors really haven't ever had a chance at 
but have been looking for/wishing for for years.  
These cels make prices appear even higher by 
generating the really big numbers.

I haven't kept -that- good an eye on all YYH 
cels, so I'm not sure if this is the case.  
However, I know I've noticed some very high 
quality cels in the past month that I don't usually 
see.

Just another something that might add to the 
snowballing/bubbling.

Keys
who is also really interested in hearing what 
more of a YYH 'expert' has to say on the matter