If we didn't express our priceless value, it wouldn't exist, and as long as we're alive, no matter what we're doing, good or bad, we are expressing our pricelessness.
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The Sandokai says here that all beings have their own virtue or merit. As human beings, we have our own nature. Only when we live like human beings, who have a selfish human nature, are we following the truth in its greater sense, because then we are taking our nature into account.
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Notice he says that our nature is to be selfish. And it's true. To be egotistical is a necessary aspect of a human being. We might complain to ourselves that we are egotistical and selfish, but actually it's kind of a necessary part of being a human being.