Happy Home Foreclosures

There must be many instances of happy home foreclosures. For example, imagine you bought a home for $300,000 putting only $15,000 down. Then the value of your home drops to $200,000. You then decide to buy another home for $300,000 and since the market has worsened you get a much larger home than you had before. Finally you default on the mortgage on your first home. On net you lose your initial $15,000 but get a much better home than before so you are better off because of the housing price fall.