Good one. There are some places in Florida still trying to recover the prices paid during the mid-1920s land boom.
When you buy swampland, you get what you pay for. See "do your homework" above.
Big difference between, say, buying real estate in Upstate New York or Southern Utah, and buying property in a storm zone, surrounded by thousands of square miles of wetlands all crawling with alligators.
But you are right in this case, so I should change that rule to "GOOD land never loses it's value".