When looking at the statistics for the BHG battleship, it is more maneuverable than any of the house battleships. I can understand how it is worth the amount paid for it.
Now the destroyer, looking at it's stats, it is slower and less maneuverable than it's house destroyer counterparts with less armor, and the same power output for roughly the same price.
Of course, I am looking at thew 4.83 statistics at the moment, might have been changed with the beta.:P