This has happened in every mmo i have ever played, you make more gold by selling the raw materials and buying the finished product.
i'll use alchemy as an example.
In my trade guilds i'd say that the average cost of a (usefull) alchemy reagent is around 200g. As most usefull potions use 3 reagents to create 4 pots (with perks) that leaves the cost of making 1 pot at 150g(without water).
still i see most people selling the end product for around 100g.
why oh why?
in my mmo experience this is the first game i've played where crafted items actualy are better than dropped to a certain extent. still it turns out this way...