To make a profit from Vanya gear, you practically need a couple of DoH at level 50 anyways, so you can't just pick one DoH and expect loads of gil rolling in.
Also whatever is mentioned here to be the most lucrative might backfire because of people reading this thread and going to try the same thing you are.

Quote Originally Posted by LeviathanElite View Post
I dont know man... A lot of vanya gear sells very quickly for a million plus gold.

I mean... I dont think a lot of it is overpriced because some of those mats are extremely expensive.
On my server the tomestone materials for making a 2 star part like that goes for like 90k each, so basically 1.8m gil you could make by just selling the materials directly. You'll barely make a profit from selling a 2 star item and even worse if you don't HQ it, then you will lose gil.