I may be "speaking" out of place, but I believe the issue is when people start classifying partis and biewers as a rare commodity (which I have seen happen) people who think they can make a quick buck off of them. When people think that money can be made they will focus on the one trait and breed only for it, ignoring the important things when breeding (health and soundness). Have you seen this thread?
http://www.yorkietalk.com/forums/gen...-luxpup-4.html
In this post you can see the link to what those pups look like.
http://www.yorkietalk.com/forums/3367356-post48.html
My guess is they breed for tinnies and the head is subsequent deformity because of it. They give it a cutesy name and market it for more money.