Earlier quoted context omitted.
Uhh, why would it eventually get spent? My inheritance is probably going to be very high.
And what are you going to do with the money? You'll spend some, invest some, etc. You'll also have kids, so even if you save it all, it'll get divided amongst more and more people. Or you'll give it all away to charity. Just look historically - are they any wealthy families that kept all the money in the family and never spent it? I don't think there are any that even lasted 3 generations before it was spent or dilut…
My family tends to put a fair share of its yearly spending into family vacations, also, which wouldn't generate any taxes for the United States. This isn't really about my family though, it just doesn't make sense that you would rely on "eventual" wealth dissipation in order to collect taxes. Also, would you seek to tax different items differently? It seems like it would be more difficult to find and tax luxury items differently than simply using a progressive income tax. Would you have to establish VAT for items imported to the country? Would this be double taxation if you bought a good which has a VAT tax in another country?