This is just bad (bad == misleading) math. Where's the appreciation of the assets? Where's the real examples from other countries that have tried wealth taxes? I don't know what he's _trying_ to do, but the effect of his rhetoric certainly seems to me that "If you won the lottery, you this would be bad for you! [but if you don't, it'd be great for you, and really only bad for ultra-rich people like me]"
I'd love to see some real numbers on "how much paul graham would pay" vs "how much your average startup founder who fails a couple times and has a moderate success or two" would pay.
Also we're talking about "over 60 years" - this isn't "government swoops in and steals half of your dragon's hoard of gold" this is "you pay taxes to support the society that allows you to safely hoard gold in the first place, and oh by the way you're still richer than anyone else and certainly wealthy enough to live a stupidly comfortable lifestyle even if 95% of your $100M assets got repo'd and you somehow managed to never appreciate your assets at all"
If it wasn't obvious, I'm clearly pro wealth redistribution, and I get that many people are fundamentally against that. It seems dumb to me to think that modest wealth redistribution is unjust or bad unless you are currently a member of the ultra rich. (and just to be clear, I feel that even a 5% wealth tax should be described as "modest")