Yep. Staying healthy is part of being able to win the cup. It always has been. If your guys can't stay healthy, that impacts their overall team worth. We're seeing it with Demko right now. He's an awesome goalie, but if he can't stay healthy, his worth to the team is lower as a result.
Guys like Cogliano, Kessel, Henrik Sedin, etc can stay healthy no matter what. It's probably part genetics, part keeping yourself in great shape, and definitely part luck as well.
It is of legitimate value when you have guys who can see key players who are struggling and target them physically. It works, it's always been a part of the game, and you need to adjust for it.