Many homes were built before the area became a flood area. They cost to raise a home and add stilts can be $30,000-$100,000 or more.
To build a home that is elevated costs more. And how high should you go?
Many people pay for flood insurance. Many areas now require home owners to have flood insurance.
Many new building codes are just now going into effect.
Many local governments are giving their ok to build in known flooded areas, and people are buying. Most homes, more people, more taxes.
So a lot of this boils down to costs and money. And change can be slow. Building homes that can withstand high winds from hurricanes, floods, tornadoes and earthquakes have been very slow to take hold.