If you bought recently, you probably had some sense that the market was a bit out of whack, but may have decided it was the right decision for other reasons. That doesn't make most people any less concerned about the future value of their house, particularly if they know they are not buying into their "Forever Home" and will one day need to sell and move elsewhere.

If you bought 20 years ago, even if a fire burnt down your house, it's likely that the land alone would give you a healthy profit. If you bought 2 years ago, a significant downturn in the market could leave you underwater.

Few people plan to sell their home shortly after buying it, but a market downturn could leave you without a job and you can't afford to move elsewhere for a job if you can't afford to take a loss by selling your house for less than your mortgage.