Del,
I am heading to the 4x4 area with my family for the first time later today. As a renter, the appeal is that it is completely remote, unique, gorgeous and will force us to relax and unplug from life for a week. I believe there will always be people looking for that type of vacation , even though some people will not be interested.
As mentioned above, flood insurance would not be required in an X flood zone, so you could choose to purchase as extra protection if you wanted.
I've done extensive research on the market and believe it can be a great investment area if you build or buy the right house. It seems the best ROI are in 9+ bedroom houses, semi-oceanfront with all the top amenities. Pool, media room, hot tub, huge decks, updated kitchen, possibly an elevator. Most are $1M+, so it's a tough starter market but I do think the potential exists for a strong investment. 4x4 land is significantly cheaper than in the paved towns and while you can't charge quite as much, the rates still get very high during peak months!