Decorations are like costumes, but for houses.
Think about it. It's October 31st. You're about to go out in some scary costume and have a good time. Of course your house is going to get jealous. So what do you do? You can't take your house with you, obviously, but you can give it its own scary costume. That's something.
At least I hope that is what's happening. I hope all of these decorations are just costumes and not what the house truly looks like.