Prices fluctuated so much because nobody knows what a WoW Token is worth now. Since the WoW Token interface also doesn’t let you know how many tokens are actually for sale at any given time, it’s unclear whether buyers and sellers are rushing into and out of the market at different price points, or whether a single gold-rich buyer using a low point as an opportunity to liquidate can send the price skyrocketing.
Something to keep in mind as well is that this will make enchanting materials more valuable, since it is likely most players will now simply scrap their boe greens instead of getting them disenchanted. Also redundant dungeon/raid gear can be scrapped rather than traded to the (guild) enchanter in the run. Less stuff gets disenchanted, meaning there will be less ecnhanting materials, meaning their value will rise. All the more reason to DE rather than scrap as an ecnhanter.