If they don't fail in some obvious way (low battery life; heavy or wearing on the ears and nose; risk of damage to the eye; can't produce true color; or something), I'd happily pay thousands of dollars for one, and I can imagine many, many other people would as well, which would help them drive costs down.

At first I thought they were holding out for a large contract from the DoD or something, but after this long I just assume there's something critically wrong with them (one of the above), or that the managers are idiots who can fail to profit from having warehouses of gold. :)