A: The WoW Token feature is designed to facilitate the exchange of gold and game time between players in as secure, convenient, and fair a way as possible, and without making players feel like they’re playing a game with their hard-earned money. Having a set current market price and a straightforward exchange system is the best way to achieve that—you don’t need to worry about whether your Token will sell or not due to being undercut or the market shifting, and everyone receives exactly the amount of gold they were quoted.
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.