Several things go into the making of a good reproduction: quality photographs of the original, the printing technique used, the printer technology used, whether to scale up or down, etc. In the end it becomes a trade-off between trying to use the best possible equipment and materials and producing a print at a price point that people can afford while making it economically feasible.
For example, depending on the size of the original, I will sometimes photograph it myself, or I will sometimes ask Fine Art Photographers to photograph it in a controlled environment with carefully balanced lighting. The latter costs money which has to be factored into the price of the prints. Substrates vary from fine-art archival paper, to museum quality paper, to museum quality high grade canvas. The better the substrate the more it costs. Some printing technologies do a great job producing the original colors - others not so much. Guess which one costs more...
Here is one example of a reproduction where I pulled out all the stops and created a life-size reproduction using professional photography and the finest museum-quality giclée printing done by fine-art specialists. The result is so good it is practically indistinguishable from the original! Now that's what I call a fine-art reproduction!
So who wants to buy one of these fantastic limited-edition giclées ???