As long as the seller is pricing the cel in the 
neighborhood of its current market value, let 
them make a profit. If you no longer feel the 
same way about a cel that you once did, you 
should have no qualms about selling it for the 
current market value. I've brought this up many 
times before. Many of us have been lucky enough 
to jump on a sweet deal now and again. I bought 
my favorite Outlaw Star cel for $35. That was two 
years ago. Do you honestly think, if I no longer 
collected the series, I would sell it for $35? 
Hell no. I would want the current market value
(and yes, each cel and scene does have an 
unwritten ballpark market value). However, 
certain online friends would get first crack at 
it out of respect. To me, that is the right way 
to handle things. No sense getting screwed on a 
deal just because you may have lost interest in 
collecting the series(or collecting as a whole).