Every value is a soft value. Everything has some usefulness, and we guess at the level of usefulness. You might think that something like an auction is good for defining hard value, but the winners curse [1] shows auctions are just good at finding people with the biggest error in their estimation. A food is another nice example. Might not be interested at all right now, but wait 24 hours without eating, and i'll be all over that meal.

Value is a slippery concept, and i think i'm willing to go out on a limb and say all value is subjective.

[1] https://en.wikipedia.org/wiki/Winner's_curse