While wealth is not zero sum, neither is it infinite sum, and indeed some components (e.g. living space in desirable locations) are very much zero sum.

Wealth also has a tendency to agglomerate. We need wealth taxes now. Anything above say 2MM belongs to the People (remember them?) anyway, perhaps we continue to license some proportion of that back to the rich for entertainment value (and to provide a funding mechanism for potentially valuable but 'bonkers' projects that might otherwise go unfunded)