> vast sums of wealth being dumped back into the economy through luxury purchases
Which feed people in remote countries minimum wage at best and keeps what looks like slavery at worst while it generates handsome profits for others who brought in very little value.
> create a disincentive for wealth accumulation
Which is actually a great thing: all that money will hit the economy much sooner.
> force those people into different investment vehicles
Like giving their offspring an education that'll allow them to pursue well paid positions. Gifts are also taxed and an exponential tax on their market value would be a smart thing. Also, they can be sure their children, no matter how deplorable, won't starve.
> That is really only import for those who are amassing large sums of wealth though
So these people who make insane amounts of money while pressuring down compensation for the rest of society will bear most of the burden. Seems only fair.
Also, keep in mind these people are far too powerful now to freely give up their advantages. These ideas have the potential of getting very, very ugly.