I VERY much doubt that this is even slightly true. I'm sure the cost most revolves around the cost of the wood which involves many things from availability to demand for MANY things not just musical instruments. It's great to keep thinking up "plausible" arguments, but that isn't the same actual reasons. Just like you somehow think that science is needed to "prove" tonewood matters. Science is not Art. You have no idea if science is sensitive enough to actually measure the things that artist say they sense. In fact it does not matter if artists ACTUALLY can sense the things they say they do. IF they think they can, then it can play a role in their art. Art is not science and science is not art. This is little different than the arguments raging between science and art over whether ESP is real or not.
Agreed. Many factors affects the $, & measurement is an issue.