Quite frankly, I don't really think there's going to be much profit in STO for currency sellers. For starters, I've found it to be extremely easy to gain energy credits (ECs). I also don't spend them on a whole lot. As a Lt Cdr 9, I have somewhere close to 50k ECs. I have no intention (currently) of spending a single one on any gear/BOffs/etc on the Exchange. I just don't see the point. To be clear, I'm not saying no one should spend money on the exchange, just that I personally don't see the point.