I think the title is very misleading. This technician lives in a house worth 1.1M but only pays interests on less than 700K. He is enjoying a profit over 300K. This is a great investment!
If he sells even below the market, he can reapp a big fat profit that is not to be laughed at. He made a smart financial decision four/five years ago. I want to applause his financial smarts.
Now the issue is if he could not afford his new payment in 2007, the best choice for him is to sell, even below the market. This will allow him to take the profit and run. In a declining market, preserve your gain/capital is the #1 priority.