IMO, the whole concept of "value" is useless when unmoored from the appraiser. Value is subjective. Something can have different value to the buyer and seller, and in fact there must be a difference in value for transactions to occur.

Whose labor is responsible for the market value of the wood. Is it the planter, the cutter, or hauler, and in what proportions? All are necessary, none are sufficient. The only way to have a meaningful assessment of "labor value" is in the the prevailing price in a labor market.