It doesn't cost anywhere near what they are charging.
To be fair, we don't know the R&D cost. It would appear this is not a reference board with a boing sticker slapped on it (see the Eyetech boards). A good portion of the price is not just hardware itself, but R&D.
I don't know what A-Eon's business plan is or their projected sales, but unless I am missing something I think they are in for a rude surprise about how many systems they can sell at this pricing. Don't get me wrong, Trevor seems like a nice guy and I genuinely wish him well.