Why Carpenter's Gothic?

I'm not really sure but it could be because the story is gloomy. It doesn't look like Liz and Paul will have a happy ending. The whole story is them falling into worse and worse financial issues. I don't think they ever loved each other but just stayed in hopes of gaining something from the relationship. A Carpenter's Gothic house is ugly to a lot of people and so is the relationship between Paul and Liz. It just grows worse and worse.