I am having a hard time swallowing this same pill. A few days ago, I traded in all my BXP for credits. I don't remember the exact number, but I estimate I got 968BXP/1 cred. I got the diviners outfit and 10 pulse cores with the exchange, for a total of 1550 credits, but I used BXP that I've just been gathering in game.
Today, I spend $49.99 real money to purchase 200 keys. I put all the dust to my lowest skill and racked up 1,520,000+ BXP. When I went to trade them in, the rate is now 5103BXP/1 credit. I spent *50 for 301 credits, and I can't even get ONE piece of the outfit I was going for!