I think if it's a snake you find particularly high quality for what you want, you would find ways to use him effectively. He may throw an offspring that is a two-morph snake that you end up replacing him with.. or he might throw just superb offspring.

I generally want animals that strike me as exceptional, even if they are a "normal". I do have some animals I got for the genes, not because I "liked" them all that much and I'm just never as excited about breeding them compared to those that I wanted specifically as an individual.