The drop rate for the vanities is fine. Some items should be super rare. I'd be in favor of tweaking the drop rates for pinks slightly. I'm not one to farm for hours on end, but in the process of leveling and just general playing of the game, like everyone else, I've done hundreds of runs in the Sewers, Nuri's, and Fang. I got two pink drops my whole time in the sewers, which seems about right. In Fang, I've seen a pink drop but never got one, and in Nuri's I've never even seen a pink drop. So the pink drops could be bumped a bit. I don't think that will affect too much, because you still have the crafted sets for those who are hardcore and willing to put the time in for the more unique stuff.