How something is made can be a significant part of the price. I remember a report on a painting that was unsigned. Experts were divided on who had painted it. I can't recall the painter's name, but if it was him, the painting was worth $200k. If it was one of his students, as half the experts thought, it was worth $2k. Same painting - only thing different is the 'metadata' for who made it, which made up literally 99% of the value.
Similarly, there is art out there where an aficionado knows how difficult it is to do and hence will pay more for it, where a layperson will say "what crap" and refuse it. The story of a piece often has value over and above the piece itself - and making something to a certain level of quality while using inferior tools can be a valid part of that story.
Typically, extra labor -- that is rewarded -- for an art piece is going to be something that is pertinent for some common end.
Using Windows 95 to paint something doesn't add anything to the end of a piece.
Using marble and creating a structure that looks like a fluid river (or flowing something) adds value to the piece even though it was hard.
Using marble, period, adds value simply because the work is in marble (monetary value) and represents a skill that you can produce works of art in marble. Using Windows 95 means you can use dated technology to produce literally the same thing that Photoshop CS6 could product (most likely in less time): a JPG.
It literally is the same difference as painting a scene with your hands, and then doing it with your feet. Nothing was added and the work is no different, but you did it with your feet.
Again, how it's made forms the story around the piece. If you saw that painting in a jumble sale, with no story, it is irrelevant how it's made. But if you know it was painted with someone's feet, then that becomes part of your appreciation of it, and hence it can become more valuable to you.
I have a small framed bit of Chinese calligraphy ("Laugh") in my bedroom. It's nice in its own way, but nothing special. It was, however, given to me by my half-sister who I only got to know for a couple of years before she died from cancer. That bit of art has a particular story attached to it now, and that story makes it worth so much more to certain people (being 'me', basically) despite the art itself being mundane. The story associated with a piece has a value of its own, sometimes entirely orthogonal to the piece itself.
Similarly, there is art out there where an aficionado knows how difficult it is to do and hence will pay more for it, where a layperson will say "what crap" and refuse it. The story of a piece often has value over and above the piece itself - and making something to a certain level of quality while using inferior tools can be a valid part of that story.