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Sounds like some of my cousins.... Getting pregnant is good, having a tiny baby and everyone's attention is good...
Then they abandon the baby on a relative and go out to get knocked up again...
We have no broody ladies.... I want Silkies!
I doubt the motivation is anything like humans. I seriously doubt they have the capability of thinking through the whole process that much. I think it's much more likely a glitch in the DNA that causes the broody/mothering instincts to go haywire. Being broody is a hormone-induced trance state. It's not something a bird decides to do. It just happens. Then the mothering instinct is produced by a brain chemical called oxytocin. If the brain doesn't produce oxytocin, the bird (or whatever critter, including humans) will not feel motherly, and will not bond with the baby or babies.
Oh, I know that.
But the whole "Hatch it, then abandon it" just reminds me deeply of my family members.
(given the choice though, I'll take a homicidal chicken over a day with the cousins. At least the chicken can provide pleasent conversation.)