Perez's friend has a point, but it makes sense for photographic books, greeting cards, mass-produced posters, etc...
A photographic print fits more in the middleground occupied by lithographs and etchings. Even if there is no mechanical imperative for limiting editions, tradition and the market insist upon it, and the majority of art photographers choose it--not just for economic reasons, but because printing does require labor--sometimes challenging labor--and time. This is time and effort that could go into producing new work, which most would prefer to staying in the dark (or at the computer) and manufacturing endless multiples.
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