JACKSON, Wyo. -- In an era when the rich are the only income group getting richer, ever-larger waves of wealth are spilling in from the coasts and swamping the resort valleys of the Rocky Mountain West. The rich are coming not just to ski, mountain-bike or build imposing second homes. They are coming to stay -- or, at the very least, secure permanent resident status for tax purposes. The moneyed invasion is driving population growth rates that are among the highest in the nation. From Aspen to Jackson to Squaw Valley, high-net-worth individuals fill sleek restaurants night after night...