My honest opinion on this is, while it is a viable option, that making key breedings to preserve your own blood is the way to go.

I could have frozen Poncho, but I didn't. I could freeze Silverback, but I won't.

Even though I respect the right of others to do what they want, my own desires lie in advancing and making NEW combinations ... not to just desperately keep breeding to the same good stud (or bitch) forever, as if I will never see another good dog or producer again.

Jack