Repeat foreclosures may be on the rise and the underwater mortgage may now be a permanent fixture in the US housing market, but you can certainly forgive the 0.01% — for whom none of that is relevant — for not caring because when your net worth exceeds $30 million, the question isn’t “can I pay my mortgage?,” but rather “where should my fifth residence be?” For these buyers, who understand Janet Yellen’s contention that accumulating financial assets is important and who have thus benefited from ...