>>Purchase a home for $200,000. Pay 10% (whatever the single flat tax rate is) tax. Not terribly complicated.
Sure. In real life the US electorate is notoriously receptive to new taxes: you'll be given a medal for sure. ;-)
FWIW, have you noticed the imminent property tax to try to help fund the Medicare hole? See what has already happened to this new tax levied at <4% if you make a capital gain, and consider what would happen if it was 10% flat rate.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1