Compared to the other coins, this one is very valuable. Now, if this coin were like the others it would not have any more value than they do. Fortunately for you, it is a unique and preciousfind. The value of something depends on its being different from other things. If individual life, our existence, is valuable then it must have some quality that sets it apart from other things in the universe.
Humans tend to believe that their lives are more valuable than the existence of rocks and coins.
In fact, we tend to think that our lives have some absolute value. Even the most valuable coin does not have absolute value because it can be lost or people may simply lose interest in coin collecting. In that case, the rarest coin in the world would be worth nothing. Coins do not have absolute value. If our lives do have absolute value, then the significance of what we do and are would never change no matter what happened.