He can stop people creating the copies. He is treating it, literally, as copyright infringment as he believes each shoe is a piece of art rather than a tool for getting around in.
I understand celebrities won't "look" at the copies, but when every man and his dog (lol) has the shoes... they won't want them. Rip-Offs, Knock-Offs, cheaper versions... if they look the same no celebrity wants it. It doesn't matter how beautiful the shoe is, or how expensive the original is.
The same thing would happen... if...
Someone brings out a shirt that says 'Hihi' on it.
All celebs wear it.
Cheap company rips off hundreds of them.
Everyone wears it, they all look real.
Celebrities see the public wearing it, and wants to stand out, wear something different etc.
Same thing happened with Von Dutch, major problems in sales due to clever rip-offs and amusing 'Von Bitch' shirts and hats. Can't say I was ever a fan in the first place.