Updated BS part to include the following:

Blacksmithing 30+

The most usefull things to come from doing BS are the abilities Maker's Muse atainable at rank 10, Ingenuity and Sublimation, both obtainable at rank 30. Sublimation specially will be very handy when you try to get those HQs with your ARM's off hand tool.
The usefulness of BS will only really come into effect at 20+ when you will be able to craft Iron Nuggets out of the ore, untill then you might also get the leve rewards which you can then turn into usable mats to grind ARM with.
BS also shares Smeltting Training with ARM and as such is another chance to save some ARM Guild Marks.