because these are ink jet prints that don't have your actual name, no number, no letter of authenticity, something you didn't physically inspect yourself, you can't really sell it as a limited edition and it won't help you sell it that way either.
so like adding that little number in the corner you added won't help you sell it, and selling it as every single product usually annoys customers if you are trying for a limited edition. in the end if you remove it after a certain amount of time, it will confuse people.
----Mike Savad
http://www.MikeSavad.com