People with 6-figure salaries pay upwards of 30%. You're full of shit.
If you double their income taxes, they'll flee to countries with lower tax rates. Here's a nice list to show you how easy it would be to find such a country:
[link]If you double the tax burden in the US from 30% to 60%, then people who can afford to move will flee to South Korea, Ireland, New Zealand, Japan, Iceland, Australia, Switzerland, Canada, the UK, or any other developed nation on that list. There are plenty of developed nations (some of them even more developed than the US) that have far lower tax rates than you're suggesting, and they will all receive the wealth that you scare away with your idiotic tax proposal.