macrocephalopod

If you start a successful startup in your twenties, a 2% wealth tax with a $50 million threshold means that over the course of your life the government will take 65% of your stock. Why so much? A wealth tax compounds. http://paulgraham.com/wtax.html 

Wealth also compounds. 2% is less than the longterm inflation adjusted returns of the S&P 500 index. Your analysis is very misleading, since a person with $50M will end up with much more than $50M at the end of their life, even adjusted for inflation, even after a 2% wealth tax.

You can just give the government shares in the company, if you can't find an investor willing to buy them at the price you want. This isn't a hard problem to solve.

wait really? you can just name a price/valuation for your company, then tell the IRS "I don't have any cash but take these shares which I promise are worth the cash even though nobody will buy them"? brb creating a company for shares to pay the IRS