forget crafting. It is a credit sink and you will spend an inordinate amount of time that will actually drain your wallet rather then enhance your equity. Bulk your toons up with scavenging, and bio for when you are in the field. Add in underworld metals and have your unused toons running those missions continuously. There is a huge profit margin. I can earn up to 300k in about an hour.
Crafting is a credit sink? My 4 million a day say otherwise, especially when they point out, that i only have to spend an hour at most to get them. Saves me the trouble of running missions, running through the wilds to gather materials or doing dailies.
That's more time i can invest in an alt or do something else outside the game.