This is an issue which is just starting to boil up to the top. One thing we are seeing is a general "distrust" (archivaly speaking) of Iris prints and their like from serious collectors. Its not that they are not being bought, only that there is still so much confusing information (and general mis-information) on just how stable they really are. The "true value" of these we only be established once you begin to see them at auction. Its the auction (or secondary market) that determines any works real value.
In other words - how much would you pay for an item if there was no limit on how much you could pay. But as Thomas states if you are involved in commercial photography of any type, its learn it or perish.