I actually think this is a very good thing to do. Keeping old crafting relevant is essential to a healthy mmo, imo. Its one of the major flaws of most mmo's like wow, etc. The fact the mats etc at least sell well make me very happy personally and its part of why I've fallen in love with the game so much. Though I have heard not all of it is actually relevant entirely, they must be selling for some reason and that is awesome because there is basically no reason to do any of it in wow.