$100,000?While mortgage fraud has abounded in recent years, voluntary foreclosures are not by themselves evidence of a newfound irresponsibility on Americans’ part…. But markets have changed, and people are changing their behavior in response….Of course, there’s a price. Mortgage “walkers” will take a hit to their personal credit rating…. That’s because, just as when markets change their behavior, people change, when people change their behavior, markets change also.