I'm gonna go ahead and say what people have said before: Nobody cares about BoEs.
Credits are, aside from training, crafting and speeder bikes (which if you have any common sense, you can afford all 3 no problem without a single credit from another player) rather useless. Sure you'll wanna buy stimpacks and stuff for endgame Ops, but your guild should be able to provide those for you.
I wouldn't worry about the economy in this game; it's doomed from the start, like so many others. With self-sufficient crafting, there's no need to rely on supply, and quest and flashpoint rewards keep you more than geared out for anything else.