you are only counting the human labour involved in the creation of value.
what about the capital?
Would you, as a hired gold miner, be able to accept zero pay for your work, until the gold is sold (then you got the full price of the sold gold)? What if you starved between the time you mined it, and the time it takes to sell? And how would you have gotten the equipment to do the mining in the first place, let alone the ownership of the mine.