"Just how difficult is it for a wealthy person to move out of the Seattle city limits?"

Quite. All the hard-working, create, highly paid people wish to live in a cool place like Seattle. 

Not everyone enjoys spending a hour or two every day stuck in gridlock traffic (or a slow ferry!).

You would profit from paying more attention to how people in the real world respond to taxes rather than Cato Institute theory. See e.g.: Kansas.

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