I sell only limited edition, gallery-framed prints of my photographs. Each is signed and comes with a Certificate of Authenticity that confirms authenticity and protects the print's value. The signature and certificate are what make those two things provable. Anyone can print a photograph. My signed, numbered prints with a certificate tie the object directly to me — it's a specific work I made and stand behind. That's what a collector is actually paying for: not just the image, but the certainty of what it is. This protects the value of the print over time. If you ever decide to sell it,(why would you do that?) the signature, edition number, and certificate are what the next buyer will ask for. With them, the print's history speaks for itself.
Limited editions are not a marketing tactic. When an edition sells out, no more prints exist. That scarcity is real, not implied, and it's part of what you're buying. A photograph printed endlessly doesn't hold the same weight as one where I've decided: this many, and no more. Gallery framing is of equal importance — it's all about presentation. A print framed to my design is ready to hang the way I intended it to be seen, with materials that complement the photograph.