As you sad: I have a couple of customers who make prints for resale, but they tend to struggle to sell their prints.
If they struggle to sell they must be sensitive to price.
On the other side question is how much experience worth in term of money - probably a lot if you are the only one who is experienced in your area, on the other side probably not much if you are surrounded by other experienced printers.
I have experienced printer in my area who is also expensive one but for recent exhibition (not mine) I was asked to made some prints, as he was busy, so in the same gallery there was his prints and my prints of similar pictures. Everyone who saw exhibition agree that my prints are the better than the prints he made. He is excellent, but he is printer, I am photographer who mostly print for myself, only some times I print for my fellows photographers, I do not do commercial printing. I also print with passion, I also have zero tolerance for print defects, but I am not considered myself as expert printer.
The other guy, as some other experienced printers I know, do a lot of talking about calibration, ink limits, linearization, profiles and so on. They have perfect mathematics of printing. On the other side I just use my Z3100 without too much consideration about such problems, let the printer do his job. But when I had my exhibition I tried almost 15 different papers before I decide which one suits best for the pictures I was printing. Also for example mentioned above. I choose different kind of paper than he did, because I feel that it will better suit to the pictures that I was printing. It seems to me that my experience as a photographer-printer combination is much more valuable then their experience as graphic designer-printer combination. They always can out talk me with their technical talks, they have so many technical gadgets, they use complicated techniques and expensive RIP software, but at the end they can not feel the soul of the picture and give to the picture what it need to be presented in a way that people who visit the gallery stayed amazed by the picture.
At the exhibition I mentioned I was fascinated how different visitors react to the different kind of printing. Pictures are very similar, same subjects, same lighting, same shooting technique. Visitors come in the front of his prints, say "nice" and continue. When they came in front of my prints they stayed there, discus the photo, talk about shooting technique that photographer use, talk about lighting that photographer use. At the end they spent much more time in front of prints I made and always ask for the price. Most of the prints I made was sold, but none of the other printer.
It is strange, he use better more expensive paper, he have much more experience in printing, better equipment, better calibration and so on. So there are different kind of experiences which reflects differently on final product.
At the end you can charge what you feel you need to charge, as long as there is someone who want to pay for it fine. But I have the feeling that to many printers are lost in the lend of numbers and charts, and that they can not find the way out of that. I can not remember where on this forum I red a comment which goes something like: "I first check which version of software printer use if he do not use latest version of Photoshop I look for another one." I was amazed with such comment, btw. I am still using Photoshop SC3, it was perfect 3 years ago and it is still perfect now.
