They have to place som many fertilised eggs because typically they do not take. It is rare to have more than 2 or 3 egs survive. 8 is a miracle.
Also I would say if you have the capacity to love and care for one child you can care for 8 or 14 or 30 or more. Teachers spend the majority of the day looking after and teaching 25 to 30 children. Nursery workers have how many babies in their charge per day?
I believe I have seen that in cases of multiple births communities rally around to provide babycare, shopping, housecleaning, cooking, laundry duties. I think this type of event brings out the best in family members and neighbhors and friends. The assistance typically lasts until the children are off to nursery. Older siblings will also help and this provides valuable lessons in caring.