Theories are welcome! 

As shown above, the under $200K market has been flat over the past year ,the $200K-$300K and $400K+ markets have increased by at least 30% over the past year -- but the $300K - $400K market has declined by 25%.

One year ago, an average of 9.8 homes were selling in this price range ($300K-$400K) each month.  That has declined (over the past year) to an average of 7.4 sales per month.