"what does it matter if someone takes your scans 
and posts them on their websites. If they do not 
have your watermark and even assuming these 
people say they own that cel, what does it 
matter?"

In this case, the person posting it and claiming 
it to be theirs can really rip an honest and 
unsuspecting person off.

"If I put on my website that I have a Van Goughs 
Sunflowers hanging on my wall, would you believe 
me? And would the real owners of the painting 
come and sue me?"

They sure as hell would if they found out you 
were trying to rip people off. But for the sake 
of arguement, let's say you just claim to have 
it. Not alot of people are going to believe you. 
Why? BECAUSE it's a VanGogh. A cel is hardly 
comparason to a VanGogh. A cel is much easier to 
claim as yours because it's not well known WHERE 
it currently is.

"I mean really do you buy/collect your cells so 
that you can say to others "I have it you dont" 
and make others jealous of you? Or do you 
collect cells for your own pleasure and 
satisfaction?"

Does it really matter? What does the purity of 
her train of thought when she bought the cel 
really have anything to do with this?