you might want to reassess your previous claim, 
"Cars depreciate 25% as soon as you drive them 
off of the lot.  Cels don't!". True cels don't 
necessarily depreciate 25% by the time you buy 
them. BUT do remember by the time most of us get 
cels they aren't NEW, let alone current in the JP 
market. Most of whats hot in the U.S. today isn't 
hot in JP at anymore. Hence while the cels you 
purchased might not appear to have depreciated 
they're market for potential resale (as any 
indicator of their popularity and profitability) 
has decreased and this will CONTINUE to DECREASE 
with the passage of time. Few series still 
command a high dollar as they did when they first 
were released. Lets take AMG Ah! Megami-sama as 
an example. When the OVAs were first released it 
was white hot in Japan AND later likewise in the 
U.S.;now the movie has been released cool, but in 
five years time do you think the same cels that 
commanded high dollar value will be able to do 
the same? Realistically no. Another great example 
is Escaflowne, the TV series cels are pretty much 
done, you don't see many new ones and the turn 
over is pretty small. The movie was well timed 
and plenty of the movie cels commanded top 
dollar, but now not only can one not find 
anything, but what one does find is arguably not 
worth the asking price. People aren't willing to 
pay the overpriced amounts for Esca movie cels or 
TV cels very often anymore. Its been well over 
four years since Esca TV came out how well do you 
think honestly, that it will do in the terms of 
resale value in five more? Not very well at all. 
The same could easily be said about Urusei 
Yatsura, Maison Ikkou, Ranma, Tenchi, Sailor 
Moon, DragonBall,et al. Its my opinion disagree 
with it if you will, that cels DO DEPRECIATE in 
value, these aren't Disney or Flischer cels were 
talking about. The market which one shouldn't 
overlook is what dictates the value of XYZ cel 
and the market shrivels up more often than not 
with the passage of time. Think about it.