But to compensate it will cost more mats in Mystic Forge (maybe twice as much?) than regular crafting.
The only reason i think ArenaNet should do this is because well it costs A LOT to level up craftings, not to mention some class will need 2,3 craftings to get all the ascended gear.
Either this or can ArenaNet make some other ways to obtain Ascended Gear, because the drop chance is really random and bad for the community.