I'm sure it's more of a case of being able to say we can build it, and for a select few, to say we own one.
But for 70k I can give a client a great 100 - 120inch screen with a fantastic picture. And I won't have to figure out how to get it into the house, let alone get the 6 people it would take to hang it on a wall.
Imagine the service nightmare if it failed.
It's much like years ago when proscan came out with the 80" big screen TV. 500lbs and it wouldn't go through a door while in the box. We had to charge 500.00 more on our delivery so we could take it apart and make it managable. I am sure they sold some (we sold 3)but it was more trouble than it was worth.