Wow.
Most of my experience has been on being offered
what I consider a obscene amount(really high)
for a cel I paid only $35 dollars for.
The only reason I didnt sel was because it was my
first cel ever(started me on this road to 
destitution) and I would never sell it.
If I offer for a cel, I always offer what I 
think its worth, and I have a pretty good eye
for cels alround, even if I dont collect them.
If the seller doesnt like it they should just 
say "no thanks" as the buyer has no way of 
knowing what they paid for it.
Of course some buyers are idiots and rude to,
as in wanting discounts on items...Ha!!!
I am far to greedy for more cash for my 
collection to ever do that(nose in air, feeling 
superior, as I fall off my chair.)
But politeness is always the key, even if they 
are idiots.
At least for me.