Actually their price has risen recently, as I use them very often in cooking baking etc, especially the dry ones. The fresh water is great with alcohol as most vacationers know.
In the past year or so could not find a good dry one, as the industry has taken off as the green ones are used to produce the abundance of water sold in groceries etc recently.
Just like the avocado / bamboo markets, the coconut market is taking of and all of its parts would be utilized in many aspects, gardening, cooking, clothing etc