I know who I am going to keep as soon as I see what's insided the egg. Unlike a lot of breeders out there, I breed for me. To amke what I want to keep, not to sell to others.
My customers are an afterthought and I generally make available to them the "other stuff' from a clutch. I pair my animals to produce what I think is cool or will work nicely in my collection. I keep the cool stuff, and sell the rest. Out of 200 eggs, I'll likely hold on to maybe 15-20 animals total.