How am I supposed to rationally engage with their thesis, given that their theory of value is so ambiguous that I can't even tell if they think the value of my house is primarily a use-value in that it enables me to laugh at the suffering of the homeless beggars of Dhaka? The fact that they refused to answer even such basic questions makes me think that, rather than attempting to engage in reasonable discourse, they are playing some kind of sadistic mind game.