I recently had this conversation with a well-known gallery owner here in Santa Fe. We were talking about Michael Kenna who limits his editions and then Arnold Newman who does not.
Michael limits his to 45 copies. So, based on his pricing, he makes about $150,000 per image, if it sells out. When the edition sells out, Michael no longer makes money on it. Only the gallery does.
On the other hand, Arnold Newman does not limit his images. So, a picture like his portrait of Stravinski has made him and his galleries a lot of money over the years.
There is also a view camera or camera arts article where John Paul Caponigro interviews his Father, Paul Caponigro on this as well. JP limits, Paul does not.
Not sure if this helps. Just a bit of reference.