How would you go about fairly distributing limited luxuries, particularly when the value to a given person varies?
I don’t think it should matter, at least not until we’ve guaranteed everyone their human rights. Nutritious food, safe shelter, clean water, medical care.
I don’t think we can afford to worry about luxuries until we solve the problem of affording people.
Of all things why would a lead brick or bananas or corn need value?
Give corn and bananas to people for free, give the lead brick to whatever science lab or nuclear power plant needs it for free.
If you want to talk about luxury value in a post-scarcity economy, choose something like coffee.