1. House market is one of the commodity futures markets.

   People do not understand how much big money they're borrowing and don't know that real estate companies can easily build more houses. Therefore, if you want to sell in the future, basically no one will purchase your old house (need more teenagers to buy). 

2. The price is decided by builders and banks (like the Fed)

   If you want to sell higher, these companies will take more advantages than the buyers. Besides, global real estate market value is the highest of all markets, does it still have more potential?