Most people believe that just because a signature 
enhances the value of other artifacts(ie Comic 
Books, Sports Cards, Movie Posters) that the same 
goes for animation cels. What gets me the most is 
the poeple who will go to great lengths to get a 
cel of(for example) Donald Duck from the 1930's, 
and then have someone(say Carl Barks) sign it! 
Why not sign an acid free piece of paper and mat 
that in with the cel? The VALUE of a cel in in 
it's inherent beauty, and once you've taken a 
black pen to that beauty you've decreased the 
value in my estimation. Let's all remember that 
these are one-of-a-kind artifacts, so they don't 
need to be any more rare than that.