Cord blood banking. Isit really necessary?

I didn’t sign as i feel the history in of both my hub and me line should be ok. Of course, if u want play safe, than u can save it, (of course choy choy, hope nothing to happen and don’t need to use.) however i think donate it, it’s better. I donate my son one. My girl i cant donate as i got dengue . To donate, you have to clear their assesment too before you are good to donate. As it’s i think 3-6k is not cheap. Can’t rmb how much.