You breed to the general TYPE for that breed. So like Lav AM's you follow the general type guidelines since the color is not yet (or may ever be) recognized by the APA
Those high priced birds were UK imports, not american project birds which is why they sold for so much. They didnt fetch a high price solely on color, it was the UK bloodline behind them
Yes, it was a color based price. They specifically say in their listing that they are NOT imports.