Yeah etherdelta is not a good exchange at all, I just put a few hundred of my eBTC on there and was trying to profit off the difference between the bid/ask ... half the time the orders fail and give you the error: "Warning! Error encountered during contract execution [Bad jump destination]" .... but you still get charged the gas for the transaction... the rest of the time you can't fill an order because "someone else has already placed this order"