It's also much easier to stay where you are than to move. Real estate is a very illiquid asset and it is supposed to be. If you perceive your house being worth more 12 months down the road it makes sense to stay until that point.

This is where you get people taking out second mortgages. It be a great idea today but horrible 5-10 years out. Once valuations correct many people will be under water and looking at defaults.

Real estate is not where you want overvaluations and (huge) inefficiencies.