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Before edit:
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So why don't the ruling rich make it so that up to $100,000 everyone pays under the current tax regime, but any income over $100k is taxed at 0% (since you've already fully paid your share to the country, i.e. on the first $100K), meaning earning $500K or $5M per year gives the same tax burden?
Nobody would vote for such a tax regime. That's why we don't have it.
Your idea idea that there is a ruling class ("dynasty like Rothschild etc") that can do whatever they want is simply not true. The country is much more democratic than that. I might as well suggest that there is a secret absolute dictator who can do whatever they want. (Also not true.)
I'm not saying it's perfect, but it's pretty obvious there isn't a ruling class even close to being able to set tax rates for themselves - or they would do so. Why do you think they don't? They can't.