Let's assume they have an average net worth of not $1M but $10M each, and that the US government is able to confiscate 100% of it, leaving them utterly penniles

Let's assume they have an average net worth of not $1M but $10M each, and that the US government is able to confiscate 100% of it, leaving them utterly penniless but netting $18B. The federal deficit for 2012 was ~$1.3 trillion, so that $18B is about 1.5% of the shortfall. I'm not saying $18B isn't significant - but focusing on 'the rich' or 'expatriates' or any other high-net-worth group just isn't going to solve America's problems.