Since you said PVE, the scope of discussion is much narrower. For thieves, PVE's useful business skill is of course tanning. You can make leather armor equipment, mail armor equipment, drums and armor plates, and you will bring drums to improve DPS when you play boss. However, the commercial value of this kind of tanning is very low. The equipment patterns you make are all made by advanced copies, and the effect is not necessarily better than that of the brand and boss (of course, there are some very good equipment, but the pattern depends on personality). A film just sells some physical DPS occupations, and the competition is fierce!