You do wonder how many people might have a beautiful signed Star Wars poster as their pride and joy in the middle of their room.. Not realising that it's completely fake!!
I know of at least a dozen posters that had to be restored to remove fake Fords after the disaster mentioned above. many of them had hundreds of in-person autographs on there already.
Yes that's always the worst case scenario... Getting the easy ones via conventions/theatre etc... and then faking the main star who isn't very easy to get at all... Thus it's 80% real, 20% fake!