Hello!
I certainly don't feel that you are insulting Celmart's 
business by simply bringing out some doubts you had in a cel
from there. I personally cannot understand why the owner
would feel this way. If his cels are genuine(and they most
certainly are, I believe^^), he has nothing to fear.

But the main point is, I find it ridiculous that a collector
has to *apologise* to a dealer for simply enquiring about a
cel. Can we, as buyers, not enquire about a cel, not just
whether it is genuine or not, but also about line-fading,
colour and stuff, after we buy it? Does the difference lie
in whether we ask the dealer privately or in a public forum?
What is the apology for? Bringing the reputation down? I 
find the need for an apology simply ludicrous.

And furthermore, as a cel collector who buys frequently 
from the net, I am concerned as to where the boundaries lie.