I'm a level 25 agent on anchorhead with an armstech of 200 and doing really well for myself REing and crafting blues and purples, 90% of which is blaster pistols for BH and companions. I will list 6 or 8 pistols before bed for 6k each or so, level 25 and often with augment slots, and they will all be gone in the morning. Buying investigation missions with prosperous yields that almost alway give purple ingredients is worth the investment for sure. I am digging armstech now that I have the rhythm down and am always keeping an eye out for underpriced stacks of crafting materials on the market. Even crafting green and blues and level 12 I was doing ok selling just pistols.
I'm not rich but I'm happy with my gear, speeder, and all trained up, with money to send the old man so he can learn crafting without sinking as much in as I had to when I started.