I'm of similar thinking to protomech:
There are also probably minimum orders for certain components as well. I wonder if the motorcycles still for sale were built mid 2014, or if some of their recent funding has been used to finish bikes that they already had significant levels of standing component inventory.
They would have placed orders for a certain level of production, whereby the volume of the parts purchased either at one time, or accumulated during the year, would provide for the pricing that they had contracted with their suppliers. Already having the sunk costs of all the on-hand inventory, for fairly expensive assemblies such as motors, controllers, battery-banks, etc., it's better financially to sell off the finished product at near-break-even pricing than to scrap all of that material and get very little in payment for 'scrap'. This assumes that much of the Empulses and Enertias are product-specific parts and not readily used in other 'propulsion-unit' applications.
As for the local Brammo dealer in my area, they still had a couple of Enertias when I checked about two weeks ago...and a cut-away view model of the Empulse (which is not of much use anymore, unless as a museum exhibit).