A nice yellow belly helps color, blush, flame and clean up almost all morphs. Even if they didn't make ivories they are still important snakes. Not only that but I still think they are just being tapped into. Have you seen a super stripe or a graphite? There's so much cool stuff out there for yellow bellies. I'm adding several females to my collection this year and hopefully a few double codoms yellow bellies.
Regards,
B