This is a very fast and recommended way to train crafting to level 30 or 40 if you have plenty of rusty coins (30K+) and do so in each dungeon, as protoleather bodies cost only 2110 coins each, not including the needle, (becomes about 21.2 coins per exp) and if you have even more money (100K+), you can gain from 9 to 20+ crafting in minutes.