maybe the reason why is because they don't want people to obtain rare items at a fast rate to the point where it makes artifact items a common thing to make.. the point of an artifact item is that its suppose to be rare and hard to obtain which is why it has the 45 minutes to craft timer and which is why it takes about an hour to get grade 6 gems or metals the crafting items is another way to make a few credits on the Market and if its easier to craft the artifacts then the value on them go down