Well, while I was certainly expecting cheaper (300-400), the tag doesn't surprise me, and strikes me as a solid indication that there will not be a higher tier of EBBs. They love having a skyrocketing price tag for the final ship in any line. Just see how the price of a BB6 or CV6 compares to a 5!
And yes, I still have enough medals for one and, having lucked out on the previous event, have nothing better to spend them on. That said, I'm still debating whether or not to fork them over.