Quote Originally Posted by Xiahou
You know, I was wondering about that one myself. If they already have an embryo why do you need the sperm/egg?
Presumably because you can get far more than 1 set of sperm/egg out of said embryo.

Look at it from a pure economic view. You can use 1 embryo to create 1 baby, or you can use 1 embryo to create 10 sets of sperm/egg and then produce 10 babies (this is making assumptions about efficiency but it's designed to be illustrativge, not accurate).

As to if that is moral, well I'm not sure.