I purchased a really expensive cel about a month
ago and just saw on Ebay someone selling an exact
copy of it (a fan cel).  Would you feel uneasy
about seeing that cel?  I don't mind fan cels so
long as they are NOT direct copies of original
cels, but I think it would be a direct violation
of copyrights if someone directly copied an
original work without getting the approval of the
studio.  I know this conversation has come up many
times in the past (so forgive me for repeating
this), but this issue seems to worry me a bit. 
Should I do anything about this?