Sorry Jake, but a density below 1 is not really a feat, especially if it is achieved using carbon/epoxy/honeycomb cured in an autoclave (supposing that this is how they are built).
At only 20% greater cost than an F18 board?
If both boards are made with the same materials and same processes (a big IF), the justification for the extra 20% is:
a) amortization of the more expensive plug b) a few extra layers of carbon c) amortization of development cost/project (but BMWO's program indirectly paid for this...)