Good, thorough reply, Drac.  I especially like 
the part about the price you paid having NOTHING 
to do with how you value a cel.  I'm exactly the 
same way.

The only way that price factors into a sale is 
in a situation where I can REPLACE the item in 
question.  Sure it makes sense to sell something 
for three times what you paid if you can go down 
the street and buy the same item again for the 
cheaper price.  But if I cel that fantastic cel, 
for whatever amount of money, there is no 
telling that I'll be able to find a similar one 
again.

As for the original question, I think that every 
cel has a price.  But I, too, rarely have people 
offer anything tempting for my own cels.  If I 
bought it for X amount of dollars and really 
wanted it, then it will probably take something 
like 5x to pry it from my hands.  Heh.

The one exception (which may come into play in 
this situation) is if the person wanting the cel 
is a good friend or contact.  I have my own 
circle of fiends...er..uh...I 
mean "friends"...who I will gladly 
give/sell/trade cels away to cheaply because I 
know that the good karma will make its way back 
to me in the future.  In that respect, it turns 
you from a cel-buying individual into a cel-
buying collective (with many pairs of eyes 
looking for goodies you like!).

In this particular scenario you just have to ask 
yourself if the money (and possible goodwill 
generated with this person/friend/dealer/etc) 
outweighs your love for the cel (and the 
possibility of ever finding it again).

JP