That is a big part of my wondering. A great new morph may be sold to someone who just loves the looks and potential for their own collection. Perhaps someone can buy a female and the seller has to have access and all/some hatchlings for the first 2-3 breedings. After that, the buyer can breed to whatever/whenever.
Some agreements can say that only a certain morph approved by the seller can be bred to that snake. Some agreements can say that the seller has first pick of the clutch(es).