DH bikes really aren't in demand, it's a very small cult thing in the biking world. The cost of manufacturing might not be worth production. It would be very interesting to see big company's books (Specialized, Trek, Giant, Cannondale, etc.)on where most of the money is made, I can guarantee it's not on the DH models.
You have never heard of Intense Cycles I take it?
Nor how well they do.