Looking at just the ROI. flames welcome.
all figures are estimates.
from parents for one child:
food and neccesities 25yrs x 12 mths x 300 is 90k
education local dip 8k + local deg 25k is 33k
total 123k
from child to parents:
allowance frm childs age 25-50yo. 25yrs x 12 mths x 800 is 240k
allowance frm childs age 50-75yo. 25yrs x 12 mths x 500 is 150k
total 390k
ROI 317%