I find that to be a somewhat reductionist view. First, some things have a fundamental energy cost. Food is one example. You can’t value food for free even if we agree to, because it takes kWhs to produce it and they have to come from somewhere. I guess you could say your life isn’t worth the cost of the food to sustain it and stop eating it, but not many will do that.

Second, you have natural scarcity: truffles are not commonly available. How much you want to eat them may put a ceiling on the price, but again there is also a floor below which no amount of energy would bring you more truffles.