Sorry Papa but I'm not quite sure who you are directing your comments at?
I agree that you certainly can't break down categories into every factory that produced, similarly that you can't ask G&M to have a category for every artist that existed, but you can expect them to control sellers who are putting items into non-related categories. It's an absolute killer for struggling auction sites.
An example, If you went to an Antiques Fair - presumably you would be a bit miffed if you went in and found it all to be repro?
And people don't look, neither do they come back to the site. How long can you expect them to spend browsing repro in the hope that they will find something genuine? Their time should be as valuable to us as our own.
There are however categories for repro and that is exactly where these products should be.