taylor 5887, back up a few post here and read what ewest has posted here. It might help with an answer for you. As I understand, it's the future genetics of the F1 and not knowing where the future will go with the new fingerlings each year. Not knowing what the future brings you verses keeping a pure strain and knowing what to expect in the future. I hope this helps, or maybe someone here can do a better job of explaining.
Tracy
