I absolutely did know that. Not only did they only pay for the bottom 1' of drywall, they wouldn't pay for the subfloor or floor joists. I took out a 40k loan and gutted the house. Interior load bearing stud walls were held up by bottle jacks while I replaced the floor joists and subfloor. Everything was replaced. Every pipe, every piece of wire, main and sub panels. Every piece of drywall, insulation. My plumbing system from the septic tank in, literally everything. I was a carpenter/contractor for 25 years so my wife and I did all the work. Stayed in a friend's house up near the city. Every night after work and every weekend we spent working on the house. Moved back in 6 months to the day after the flood. The same month the house flooded my best friend and another laborer were shot to death in N. St. Louis on a job I would have been at except I was out on bereavement because my little brother had just died of a drug overdose. 2 weeks later my daughter gave birth to a baby girl who lived 36 hours and then died. It was a really fucked up 6 weeks.
Back on point, we had no contents coverage because even though the house never flooded before and was built in 1956 my premiums were higher than my homeowners insurance premiums ( and still are). So we got totally fucked. Now we have 160k worth of contents coverage so we figure we're as safe as we can be for the moment. In a few months when the note is paid off we'll drop the coverage for the house back down to something more reasonable. And you're right, flood insurance is absolutely a scam. Unfortunately my back yard ends at a river and I am in what is called a "Special flood way". I would have moved out after the flood but the problem is I would still have to pay for it whether I lived in it or not. And at 50 ( at the time) years old I wasn't looking to have a mortgage for the next 15 years.