Perhaps "labor value" would disappear but it grants workers "spending choice" which generates "happiness" (workers can spend money on luxuries), "influence" (middle class is more capable of political action that subsistence farmers), allows for further downstream effect to increase production capacity (additional capital investment into yacht building business). Basically, there is much more to life than labor value and exchange media have effects other than shifting around labor value. At any rate, there is something fundamentally wrong suggesting that either party in exchange is more moral than other since for every buyer there is a seller, and i don't buy that someone can say "i am moral because i exchange with someone who is immoral."