For a cutting board, I can spend a lot less to have one I find functional, in terms of size, material, etc (and I have). So, "NO", I'd never spend $150 on any cutting board.
For me (and just me), I don't see these as cutting boards. I see them as a fine piece of beautiful wood. Being that it is made from ebony, nicely crafted and presented, I can understand the price more. And that's how I'd treat it, as a display item to be admired. That said, I have other things that I'd rather spend that $150 on.