I am not a breeder, but i have my ideas and am curious to see if others share them as well. I would think quality would be a high priority. Necesity would be a close second. if your short on females you may hold a few quality females back for later seasons. I would also think space. If you produce a multi gene animal that could replace 2 or 3 snakes, and open up room in your collection for more morphs and projects. Finally accomplishing a step in a project and keeping off spring to prove out or continue your project.