Sure there are worse looking houses in Columbus, but that doesn't mean that the people who live there deserve a new one just because they themselves are too poor and won't get a fucking job.
So, your logic is find the worst house and then re-make it?
The show isn't necessarily about that they cannot survive in their current situation. It is about doing something good for someone deserving and making it a dream home. The show isn't about "Oh, these people can't survive in that house." If that were the case, they would just go find homeless people and say give them houses.