I'm not saying he should demand a female as his pick. I am saying that you can game plan likely senarios and agree ahead of time what the outcome will be. You can also vary from the every other pick in order to get him the one snake he really wants without upsetting the value equalibrium.

I like the idea of applying the value of his even numbered picks to the value of getting the breeders first pick or another female from a different clutch. You can easily come up with a price (allowing some range for quality) for all possible offspring and the other female snakes he is willing to sell at the time. Then after the picks are made he trades the value of his picks for an appropriately priced snake and he should probably be given the option to add cash to make the deal work if needed.

Or if the breeder wanted to roll the dice they could agree that if X female snake is produced he gets it and the breeder gets everything else no matter what.

There are a thousand different ways to arrange it. They just have to both agree that they are good with it.

Just suggesting ideas to avoid a situation where one or both is disappointed or mad. I hate the idea of just waiting until hatch day to think about how it will play out.