AKA Risk versus reward.
What are you really willing to give up in order to win? This is a question posed by both Duel Masters and Dimension Zero, you can allow yourself to take a hit in order to create a future advantage. Others do similar things with life points but it never really feels like you're making a meaningful sacrifice unless you don't have much to give, like DM's limited shields that are unlikely to be recovered. It's common knowledge that life total is irrelevant in all of these games though, as the only point you really have to protect is the last one.