It was decided the calculation would be changed to make items less easily obtainable. It can change again in near future, but maybe not. More items will be added in time.
The announcement from Kaer was made before the marketplace redesign was decided. Before, professions, bags, gems and other items were available and with a cheap price, you had to click a few times once a day to obtain them.
And remember MoP gear is not at it's last tier. Once it reaches the last tier, everything you buy from the marketplace will remain on your character forever, unless you get to the heroics. It needs to be difficult to obtain the best gear available.

