The digital negative and printing technology is making exact copies of your photographic work. Limited editions are used as a solution for scarcity and pricing.
Instead of having an arbitrary number of prints in an edition, base editions on geographical location. Each print can be limited to a state or country, and part of the signature of the artist on the print will include the location it “belongs to.” This means that some locations will sell for higher prices as there might be more collectors there, and the signature will guarantee and be proof of the value of that specific print even if it later moved to another location or resold. The provenance of where it was originally sold will keep its value.
Books, even ebooks are fixed things. What you get is a finite product of that edition. Most likely by the time you read it, at least some things have changed.
Create a format that allows the author to push new editions to current buyers of previous versions. The reader will get an alert that he has now a new edition; a brief description of the changes and additions; and the possibility to read any of the editions published, and at any point also see the current text’s other edition versions.