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For the sake of this discussion, those with income above $415,051 / year (this number adjusts with inflation; i.e., it's in 2016 dollars).

hmmm.. that's a minnow to the really rich pips
I've seen a documentary of rich kids from HK and China
their small yacht costs more than that
one Chinese guy is a jeweler in the UK
he sells and hour glass of diamond for 750k
i wonder what he makes in a year

I'm only talking about the US, I can't speak to how other countries tax their citizens. But yes, even if that tax level is reasonable for someone earning $500k a year, there should be more severe brackets for those earning in the millions.