Personally, I think those high prices will draw in ill-fitted owners who don't truly care about their dogs.
Someone willing to spend $5400 on a pet quality dog a) hasn't researched the breed, b) can throw large amounts on money on purchases on a regular basis, and more than likely don't truly care about what they're buying, and c) will probably put the puppy in the same category as their old Louis Vuitton bag hanging in the back of their closet.