Banking on cord blood

If I were pregnant right now I would seriously consider storing my baby’s umbilical cord blood as a sort of health insurance policy but would I be better donating it to the public cord blood bank for the greater good?

With advances in stem cell therapy charging ahead it seems plausible that within the next decade or so cord blood will play a leading role in the treatment of a wide variety of diseases.  

But for parents-to-be it must be difficult to decide whether it's worth the rather high financial cost of storing their baby's cord blood in a private bank on the off chance they